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

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

    // Read input line by line
    while (fgets(priklad, sizeof(priklad), stdin) != NULL) {
        count++;

        // Parse expression and evaluate it
        char *start = priklad;
        char *end = NULL;
        int valid = 1;
        float num1 = strtof(start, &end);
        if (end == start) {
            printf("KONIEC\n");
            continue;
        }
        start = end;

        // Find the operation symbol
        char op = *start;
        if (op != '+' && op != '-' && op != '*' && op != '/') {
            valid = 0;
        }
        start++;

        // Parse second number
        float num2 = strtof(start, &end);
        if (end == start) {
            valid = 0;
        }
        start = end;

        // Check for extra characters
        while (*start != '\0') {
            if (*start != '\n' && (*start < '0' || *start > '9') && *start != '.' && *start != ' ') {
                valid = 0;
                printf("CHYBA\n");
                start++;
            break;
            }
        }

        float result=0;
        if (valid) {
            switch (op) {
                case '+':
                    result = num1 + num2;
                    break;
                case '-':
                    result = num1 - num2;
                    break;
                case '*':
                    result = num1 * num2;
                    break;
                case '/':
                    result = num1 / num2;
                    break;
            }
            }

            // Round result and compare to expected value
            float expected;
            if (sscanf(start, "%f", &expected) != 1) {
                continue;
            }
            expected = round(expected * 100) / 100;
            if (fabs(result - expected) < 0.001) {
                printf("OK\n");
            } else {
                printf("ZLE\n");
            }
        }
    

    return EXIT_SUCCESS;
}