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

int main() {
    char riadok[100];

    while (fgets(riadok, sizeof(riadok), stdin)) {

        // prázdny riadok -> KONIEC
        if (riadok[0] == '\n') {
            break;
        }

        char *r = riadok;
        char *end;

        // preskoč medzery
        while (*r == ' '){
            r++;
        }

        // 1. číslo
        float a = strtof(r, &end);
        if (r == end) {
            printf("CHYBA\n");
            continue;
        }
        r = end;

        while (*r == ' '){
            r++;
        }

        // operátor
        char or = *r;
        if (!(or == '+' || or == '-' || or == '*' || or == '/')) {
            printf("CHYBA\n");
            continue;
        }
        r++;

        while (*r == ' '){
            r++;
        }

        // 2. číslo
        float b = strtof(r, &end);
        if (r == end) {
            printf("CHYBA\n");
            continue;
        }
        r = end;

        while (*r == ' '){
            r++;
        }

        // '='
        if (*r != '=') {
            printf("CHYBA\n");
            continue;
        }
        r++;

        while (*r == ' '){
            r++;
        }

        // výsledok
        float c = strtof(r, &end);
        if (r == end) {
            printf("CHYBA\n");
            continue;
        }
        r = end;

        // výpočet
        float cislo;

        if (or == '+') cislo = a + b;
        else if (or == '-') cislo = a - b;
        else if (or == '*') cislo = a * b;
        else {
            if (fabs(b) < 0.000001) {
                printf("ZLE\n");
                continue;
            }
            cislo = a / b;
        }

        // porovnanie s toleranciou
        if (fabs(cislo - c) <= 0.001) {
            printf("OK\n");
        } else {
            printf("ZLE\n");
        }
    }

    return 0;
}