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

int main() {
    char* input = (char*) calloc(100, sizeof(char));
    char symbol;
    int counter;
    int operation;
    char* number1 = (char*) calloc(25, sizeof(char));
    char* number2 = (char*) calloc(25, sizeof(char));
    char* result = (char*) calloc(30, sizeof(char));
    char* ptr;
    bool equals = false;

    for(int i = 0; fgets(input, 100, stdin) != NULL; i++){
        if(!input || !strcmp(input, "") || input[0] == EOF || input[0] == '\n' || input[0] == '\0')
            break;
        counter = 0;
        operation = 0;
        equals = false;
        memset(number1, '\0', 25);
        memset(number2, '\0', 25);
        while(input[counter] != '\0' && input[counter] != '\n'){
            symbol = input[counter++];
            while (isspace(symbol))
                symbol = input[counter++];
            if(symbol == '\0' || symbol == '\n')
                break;
            switch (symbol) {
                case '+':
                    operation = 1;
                    break;
                case '-':
                    operation = 2;
                    break;
                case '*':
                    operation = 3;
                    break;
                case '/':
                    operation = 4;
                    break;
                case '=':
                    equals = true;
                    break;
                default:
                    if (isdigit(symbol) || symbol == '.'){
                        if (operation == 0)
                           strcat(number1, symbol+"");
                        else if(!equals)
                            strcat(number2, symbol+"");
                        else
                            strcat(result, symbol+"");
                    }
                    else{
                        printf("CHYBA\n");
                        goto LABEL;
                    }
                    break;
            }
        }
        LABEL:
        switch(operation){
            case 1:
                printf("%s\n", (strtof(number1, &ptr) + strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) + strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
                break;
            case 2:
                printf("%s\n", (strtof(number1, &ptr) - strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) - strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
                break;
            case 3:
                printf("%s\n", (strtof(number1, &ptr) * strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) * strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
                break;
            case 4:
                printf("%s\n", (strtof(number1, &ptr) / strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) / strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
                break;
            default:
                printf("CHYBA\n");
        }
    }

    free(input);

    return 0;
}