#include <stdio.h>

int main(){
    while(1){
        char read[1000000];
        scanf("%[^\n]", read);
        float num1, num2, answer;
        char action;
        sscanf(read, "%f %c %f %*c %f", &num1, &action, &num2, &answer);
        if(action != '/' && action != '*' && action != '-' && action != '+'){
            printf("CHYBA\n");
            return 0;
        }
        float check = (action == '/') ? num1 / num2 : (action == '*') ? num1 * num2 : (action == '+') ? num1 + num2 : num1 - num2;
        check *= 100000;
        int tmp = check;
        check = (float) tmp / 100000;
        answer *= 100000;
        tmp = answer;
        answer = (float) tmp / 100000;
        printf("%s\n", (check == answer) ? "OK" : "ZLE");
        //printf("%f\n", check);
    }
}