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

#define MAX_LEN 100

const char* evaluate_expression(char *expression){
    double num1, num2, result, computed_result;
    char op;
    
    if(sscanf(expression, " %lf %c %lf = %lf ", &num1, &op, &num2, &result) != 4) return "CHYBA";
    
    switch(op){
        case '+': computed_result = num1 + num2; break;
        case '-': computed_result = num1 - num2; break;
        case '*': computed_result = num1 * num2; break;
        case '/': if (num2 == 0) return "ZLE"; computed_result = num1 / num2; break;
        default: return "CHYBA";
    }
    
    return (round(computed_result * 100) / 100 == round(result * 100) / 100) ? "OK" : "ZLE";
}

int main(){
    char line[MAX_LEN];
    while(fgets(line, sizeof(line), stdin) && line[0] != '\n'){
        printf("%s\n", evaluate_expression(line));
    }
    return 0;
}