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

int main() {
    int ch = getchar();
    char priklad[300];
    int count = 0;

    for (int idx = 0; 1; idx++) {
        priklad[idx] = ch;
        if (ch == '\n') {
            count++;
        }
        ch = getchar();
        if ((priklad[idx] == '\n' && ch == '\n') || ch == EOF) {
            break;
        }
    }

    char *start = priklad, *end = NULL;

    for (int c = 0; c < count; c++) {
        int skip = 0, z = 0;

        for (int idx = 0; start[idx] != '\n'; idx++) {
            if (start[idx] == '+' || start[idx] == '-' || start[idx] == '*' || start[idx] == '/') {
                z = 1;
            }
            if ((start[idx] < '0' || start[idx] > '9') && start[idx] != ' ' && start[idx] != '=' && start[idx] != '+' && start[idx] != '-' && start[idx] != '*' && start[idx] != '/' && start[idx] != '.') {
                skip = 1;
                printf("CHYBA\n");
                while ((*start) != '\n') {
                    start++;
                }
                start++;
                break;
            }
        }

        if (skip == 1) {
            continue;
        }
        if (z == 0) {
            while ((*start) != '\n') {
                start++;
            }
            start++;
            printf("CHYBA\n");
            continue;
        }
        float num1 = strtof(start, &end);
        if (end == start) {
            printf("KONIEC\n");
        }
        while ((*start) != '+' && (*start) != '-' && (*start) != '/' && (*start) != '*') {
            start++;
        }
        char znak = (*start);
        start++;

        float num2 = strtof(start, &end);
        start = end;
        while (((*start) < '0' || (*start) > '9') && (*start) != '-') {
            start++;
        }

        float vysledok2 = strtof(start, &end);
        start = end;
        start++;
        float vysledok = 0;

        if (znak == '-') {
            vysledok = num1 - num2;
        } else if (znak == '+') {
            vysledok = num1 + num2;
        } else if (znak == '*') {
            vysledok = num1 * num2;
        } else if (znak == '/') {
            vysledok = num1 / num2;
        }
        vysledok = (round(vysledok * 100)) / 100;
        if (vysledok2 - vysledok < 0.001 && vysledok2 - vysledok > -0.001) {
            printf("OK\n");
        } else {
            printf("ZLE\n");
        }
    }
    return EXIT_SUCCESS;
}