#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <ctype.h>

float plus(float total, float number);
float minus(float total, float number);
float divided(float total, float number);
float multiplied(float total, float number);

int main() {
        char buffer[999];
        char equation[999][20];
        char output[999][10];
        int output_length = 0;
        int eq_index = 0;
        int index = 0;
        while (fgets(buffer, sizeof(buffer), stdin) != NULL) {
                int error = 0;
		if (buffer[0] == '\n') break;
                index = 0;
                eq_index = 0;
                int eq_operand_length = 0;
                while (buffer[index] != '\n' && buffer[index] != '\0') {
                        
                        if (isspace(buffer[index])) {
                                index++;
                                continue;
                        }
			if ((isalpha(buffer[index]) || strchr(".+-*/=123456789\n", buffer[index]) == NULL) && !error) {
				error = 1;
				strcpy(output[output_length], "CHYBA");
				output_length++;

			}
                        if (isdigit(buffer[index]) || (buffer[index] == '.' && eq_operand_length > 0 && isdigit(buffer[index + 1])) || (buffer[index] == '-' && (eq_operand_length == 0 || strchr("+-*/=", buffer[index - 1])))) {
                                equation[eq_index][eq_operand_length] = buffer[index];
                                eq_operand_length++;
                        }
                        else if (strchr("+-*/=", buffer[index]) != NULL) {
                                if (eq_operand_length > 0) {
                                        equation[eq_index][eq_operand_length] = '\0';
                                        eq_index++;
                                        eq_operand_length = 0;
                                }
                                equation[eq_index][0] = buffer[index];
                                equation[eq_index][1] = '\0';
                                eq_index++;
                        }
                        index++;
                }
                if (eq_operand_length > 0) {
                        equation[eq_index][eq_operand_length] = '\0';
                        eq_index++;
                }
                float total = 0.0;
                char last_operator = '+';
                int sign = 0;
                int n_of_signs = 0;
                char operators[6] = "+-=*/";
                if (!error) {
		for (int i=0;i<eq_index;i++) {
                        n_of_signs = 0;
                        for (int l=0; l<5;l++) {
                                if (strchr(equation[i], operators[l]) != NULL) {
                                        if ((strlen(equation[i]) > 1) && (equation[i][0] == '-'))
                                                continue;
                                        n_of_signs++;
                                }
                        }
                        if (((n_of_signs == 1) && sign && (strlen(equation[i]) == 1)) || ((n_of_signs == 0) && !sign)) {
                                if (!sign) {
                                        switch (last_operator) {
                                                case '+':
                                                        total = plus(total, atof(equation[i]));
                                                        break;
                                                case '-':
                                                        total = minus(total, atof(equation[i]));
                                                        break;
                                                case '*':
                                                        total = multiplied(total, atof(equation[i]));
                                                        break;
                                                case '/':
                                                        total = divided(total, atof(equation[i]));
                                                        break;
                                                case '=':
                                                        if (fabs((round(total * 100) / 100) - atof(equation[i])) < 1e-6) {
                                                                strcpy(output[output_length], "OK");
                                                                output_length++;
                                                        } else {
                                                                strcpy(output[output_length], "ZLE");
                                                                output_length++;
                                                        }
                                                        break;
                                        }
                                } else {
                                        last_operator = equation[i][0];
                                }
                        } else {
                                strcpy(output[output_length], "CHYBA");
                                output_length++;
                                break;
                        }
                        sign = !sign;
                }
		}
                memset(equation, 0, sizeof(equation));
		//printf("%f - %f\n",total, (round(total * 100) / 100));
        }
        for (int i=0; i<output_length; i++) {
                printf("%s\n", output[i]);
        }

        return 0;
}

float plus(float total, float number) {
        return total + number;
}

float minus(float total, float number) {
        return total - number;
}

float divided(float total, float number) {
        return total / number;
}

float multiplied(float total, float number) {
        return total * number;
}