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

char* check_math_problem(const char* problem) {
    if (strlen(problem) == 0) {
        return "CHYBA";
    }

    double n1, n2, res;
    char sing, equel;

    if(sscanf(problem, "%lf %c %lf %c %lf", &n1, &sing, &n2, &equel, &res) != 5) {
        return "CHYBA";
    }

    double result;
    switch (sing) {
        case '+':
            result = n1 + n2;
            break;
        case '-':
            result = n1 - n2;
            break;
        case '*':
            result = n1 * n2;
            break;
        case '/':
            if (fabs(n2) < 1e-9) { 
                return "ZLE";
            }
            result = n1 / n2;
            break;
        default:
            return "CHYBA";
    }

    if (fabs(result - res) < 0.01) {
        return "OK";
    } else {
        return "ZLE";
    }
}

int main() {
    char problem[100]; 

    while (true) {
        fgets(problem, sizeof(problem), stdin);
        if (strlen(problem) <= 1) { 
            break;
        }
        printf("%s\n", check_math_problem(problem));
    }

    return 0;
}