#include <stdio.h>
#include <stdlib.h>
#include <string.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 row[999];
	char equation[999][20];
	char output[999][10];
	int output_length = 0;
	int index = 0;
	int eq_index = 0;
	while (fgets(buffer, sizeof(buffer), stdin) != NULL) {
		if (buffer[0] == '\n') break;
		index = 0;
		eq_index = 0;
		int eq_operand_length = 0;
		while (buffer[index] != '\n') {
			if (buffer[index] != ' ') {
				equation[eq_index][eq_operand_length] = buffer[index];
				eq_operand_length++;
			}
			else {
				equation[eq_index][eq_operand_length] = '\0';
				eq_operand_length = 0;
				eq_index++;
			}
			index++;
		}
		float total = 0.0;
		int sign = 0;
		char out[10] = "";
		int n_of_signs = 0;
		char operators[6] = "+-=*/";
		char last_operator = '+';	
		for (int i=0;i<eq_index+1;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 (total == atof(equation[i])) {
								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;	
		}
		//printf("%s\n",out);

	}
	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;
}