/******************************************************************************

                            Online C Compiler.
                Code, Compile, Run and Debug C program online.
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*******************************************************************************/

#include <stdio.h>
#include<string.h>
#include<math.h>
#include<stdlib.h>
char* compactString(char *src,int leng) {
    char *new_str = (char*)calloc(leng+1,sizeof(char));
    int k=0;
    for(int i=0;i<leng;i++){
        if(src[i]!=' '){
            new_str[k] = src[i];
            k++;
        }
    }
    return new_str;
}



double operation(double first,double second,char c){
    double x =0;
    if(c=='*'){
         x=first*second;
        return x;
    }
    else if(c =='-'){
         x=first-second;
        return x;
    }
    else if(c=='/'){
         x=first/second;
        return x;
    }
    x= first+second;
    return x;
}


double round_to(double value, double eps)
{

  return floor(value/eps + 0.5) * eps;
}

double compare_percent(double a, double b, double eps)
{
  double diff = round_to( (a - b) * 2 / (a + b), eps);
  return diff < 0 ? -1 : diff > 0 ? +1 : 0;
}



int main()
{
    char str[100];
    memset(str,0,100);
    fgets(str,100,stdin);
    char *new_str = compactString(str,strlen(str));
    double first =-5,second =-5,res=-5;
    char c='E';
    sscanf(new_str,"%lf%c%lf%*[=]%lf",&first,&c,&second,&res);
    
    
    if(c=='E'||first==-5||second==-5||res==-5){
        printf("CHYBA\n");
        return 0;
    }
    double my_res = operation(first,second,c);
    if(compare_percent(res,my_res,0.01)==0){
        printf("OK\n");
    }
    else{
        printf("ZLE\n");
    }
    
    
    return 0;
}