#include <stdio.h>
#include <math.h>
#define cislo123 0.01

int main() {
    char input[100];
   
    if (fgets(input, sizeof(input), stdin) != NULL && input[0] == '\n') {
        return 0;
    }    
    
    
    double cislo1;
    double cislo2;
    double result;
    char znak;
    char rovno;
    int colznakov = sscanf(input, "%lf %c %lf %c %lf", &cislo1, &znak, &cislo2, &rovno, &result);

    if (colznakov != 5 || rovno != '=') {
        printf("CHYBA\n");
        return 0;
    }

    double result2;

    switch (znak)
    {
    case '+':
        result2 = cislo1 + cislo2;
        break;
    case '-':
        result2 = cislo1 - cislo2;
        break;
    case '*':
        result2 = cislo1 * cislo2;
        break;
    case '/':
            if (cislo2 == 0) {
                printf("Chyba!\n");
                return 0;
            }    
                result2 = cislo1 / cislo2;
                break;
            default:
                printf("ZLE\n");
                return 0;
        }


        result2 = round(result2 * 100) / 100;

        if (fabs(result2 - result) < cislo123) {
            printf("OK\n");
        } else {
            printf("ZLE\n");
        }
    
    return 0;
    }