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

int main() {
    char riadok[1000];
    double cislo1, cislo2, vysledok, ocakavany;
    char ligma;
    
    while (fgets(riadok, 1000, stdin) && riadok[0] != '\n') {
        if (sscanf(riadok, "%lf %c %lf = %lf", &cislo1, &ligma, &cislo2, &ocakavany) != 4) {
            printf("CHYBA\n");
            continue;
        }
        
        if (ligma != '+' && ligma != '-' && ligma != '*' && ligma != '/') {
            printf("CHYBA\n");
            continue;
        }
        
        switch (ligma) {
            case '+': vysledok = cislo1 + cislo2; break;
            case '-': vysledok = cislo1 - cislo2; break;
            case '*': vysledok = cislo1 * cislo2; break;
            case '/': vysledok = cislo2 == 0 ? 0 : cislo1 / cislo2; break;
        }
        
        vysledok = round(vysledok * 100) / 100;
        ocakavany = round(ocakavany * 100) / 100;
        
        printf(fabs(vysledok - ocakavany) < 0.001 ? "OK\n" : "ZLE\n");
    }
    return 0;
}