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

int main(){
    char* input = (char*) calloc (100, sizeof(char));
    char symbol = '\0';
    int counter = 0;
    int operation = 0;
    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); i++){
        counter = 0;
        operation = 0;
        equals = false;
        memset(number1, '\0', 25);
        memset(number2, '\0', 25);

        while (input[counter] != '\0'){
            symbol = input[counter++];
            while(isspace(symbol))
                symbol = input[counter++];
            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) 
                            number1 += symbol;
                        else if (!equals)
                            number2 += symbol;
                        else
                            result += symbol;
                    }
                    else if(!isdigit(symbol)){
                        printf("CHYBA");
                        goto LABEL;
                    }
                    break; 
            }
        }
        LABEL:
        switch(operation){
            case 1:
                printf("%.s\n", (strtof(number1, &ptr) + strtof(number2, &ptr) == strtof(result, &ptr)) ? "OK" : "ZLE");
                break;
            case 2:
                printf("%.s\n", strtof(number1, &ptr) - strtof(number2, &ptr) == strtof(result, &ptr)) ? "OK" : "ZLE");
                break
            case 3:
                printf("%.s\n", strtof(number1, &ptr) * strtof(number2, &ptr) == strtof(result, &ptr)) ? "OK" : "ZLE");
                break;
            case 4:
                printf("%.s\n", strtof(number1, &ptr) / strtof(number2, &ptr) == strtof(result, &ptr)) ? "OK" : "ZLE");
                break;
            default:
                printf("CHYBA");
        }
    }

    return 0;
}