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

#define SIZE 128

//kontrola, ze ci vycitane informacie su aritmeticky spravne
//VRACIA: int: -1 (CHYBA), 0 (False), (True)
float IsArithCorrect(float num1, float num2, char* op, float result)
{

    switch (*op)
    {
        case '-':
        if ((num1-num2) == result) { return 1;}
        break;

        case '+':
        if ((num1+num2) == result) { return 1;}
        break;

        case '*':
        if ((num1*num2) == result) { return 1;}
        break;

        case '/':
        if (num2 == 0) { return -1;}
        if ((num1/num2) == result) { return 1;}
        break;
    }

    return 0;

}

int main()
{
    //pomocne premeny
    char line[SIZE], strBuffer[SIZE];
    line[0] = '\0';
    strBuffer[0] = '\0';
    char* strtofEndPtr;



    while (fgets(line, SIZE, stdin) != NULL)
    {
        if (sscanf(line, "%127[^\n]", strBuffer) == 1)
        {
            bool isLineInvalid = false;
            //docasne 'char' premeny
            char num1Temp[10], num2Temp[10], resultTemp[10];
            num1Temp[0] = '\0';
            num2Temp[0] = '\0';
            resultTemp[0] = '\0';
            
            bool hasOper = false;
            bool hasEqualsSign = false;

            char op1 = 'N';  //N = 'None/NIC'

            for (int i = 0; strBuffer[i] != '\0'; i++)
            {
                if (isdigit(strBuffer[i]) != 0) 
                {
                    //skontroluj, ze ci char po nom je tiez cislo (a NIE je desat. bodka), AK NIE, povazuj buduce cisla v riadku ako ine cislo 
                    // a inkrementuj kontrolnu citaciu premenu
                    if (isdigit(strBuffer[i+1]) == 0 && strBuffer[i+1] != '.') 
                    {
                        writeIntoArrayNum += 1;
                    }

                    switch (writeIntoArrayNum)
                    {
                        case 1:
                        strncat(num1Temp, &strBuffer[i], 1);
                        break;

                        case 2:
                        strncat(num2Temp, &strBuffer[i], 1);
                        break;

                        case 3:
                        strncat(resultTemp, &strBuffer[i], 1);
                        break;
                    }
                    continue;
                }

                if (ispunct(strBuffer[i]) != 0)
                {
                    //ak je to nejaky printable symbol ('*/-,:./), skontroluj ci to nie je artimeticke znamienko alebo desatinna bodka (a udel im vynimku)
                    //AK NIE, povazuj za riadok neplatny...
                    if (strBuffer[i] == '=')
                    {
                        continue;
                    }

                    if (strBuffer[i] == '+' || strBuffer[i] == '-' || strBuffer[i] == '/' || strBuffer[i] == '*')
                    {
                        op1 = strBuffer[i];
                    }
                    else if (strBuffer[i] == '.')
                    {
                        //zisti, kde treba zapisat desatinnu bodku
                        switch (writeIntoArrayNum)
                        {   
                            case 1:
                            strncat(num1Temp, &strBuffer[i], 1);
                            break;

                            case 2:
                            strncat(num2Temp, &strBuffer[i], 1);
                            break;

                            case 3:
                            strncat(resultTemp, &strBuffer[i], 1);
                            break;
                        }
                    }
                    else
                    {
                        isLineInvalid = true;
                        break;
                    }
                    
                    continue;
                }

                if (isalpha(strBuffer[i]) != 0)
                {
                    isLineInvalid = true;
                    break;
                }
             }
            float num1 = strtof(num1Temp, &strtofEndPtr);
            float num2 = strtof(num2Temp, &strtofEndPtr);
            float resultNum = strtof(resultTemp, &strtofEndPtr);

            //** konecna faza = vypisovanie vysledkov

            //ak systematicka chyba
            if (isLineInvalid || op1 == 'N' || IsArithCorrect(num1, num2, &op1, resultNum) == -1)
            {
                printf("CHYBA\n");
            }
            else if (IsArithCorrect(num1, num2, &op1, resultNum) == 0)
            {
                printf("ZLE\n");
            }
            else
            {
                printf("OK\n");
            }
        }
    }
    return 0;
}