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

int main() {
    char line[300];
    int count = 0;
    while (fgets(line, sizeof(line), stdin)) {
        count++;
        char *start = line, *end = NULL;
        int has_operator = 0;
        float num1 = 0, num2 = 0, expected_result = 0;
        char op, *next;

        while (*start != '\n') {
            if (*start == '+' || *start == '-' || *start == '*' || *start == '/') {
                if (has_operator) {
                    printf("CHYBA\n");
                    goto next_line;
                }
                has_operator = 1;
                op = *start;
            } else if ((*start < '0' || *start > '9') && *start != ' ' && *start != '=' && *start != '.') {
                printf("CHYBA\n");
                goto next_line;
            }
            start++;
        }

        if (!has_operator) {
            printf("CHYBA\n");
            goto next_line;
        }

        num1 = strtof(line, &next);
        while (*next == ' ') next++;
        if (*next != op) {
            printf("KONIEC\n");
            goto next_line;
        }
        next++;
        num2 = strtof(next, &next);
        while (*next == ' ') next++;
        if (*next == '=') {
            next++;
            expected_result = strtof(next, &next);
            while (*next == ' ') next++;
        } else {
            goto next_line;
        }

        float result;
        switch (op) {
            case '+':
                result = num1 + num2;
                break;
            case '-':
                result = num1 - num2;
                break;
            case '*':
                result = num1 * num2;
                break;
            case '/':
                result = num1 / num2;
                break;
        }
        result = roundf(result * 100) / 100;
        if (fabs(result - expected_result) < 0.001) {
            printf("OK\n");
        } else {
            printf("ZLE\n");
        }
        next_line:
        continue;
    }
    return EXIT_SUCCESS;
}