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




void add(double a, double b, double c,char ac, int result[],int count){
    float cc=a+b;
    if(cc==(float)c || a+b==c) result[count]=1;
    else result[count]=2; 
}

void subtr(double a, double b, double c,char ac, int result[],int count){
    if(a-b==c) result[count]=1;
    else result[count]=2; 
}

void multi(double a, double b, double c,char ac, int result[],int count){
    if(a*b==c) result[count]=1;
    else result[count]=2; 
}

void divi(double a, double b, double c,char ac, int result[],int count){
    float cc=a/b;
    double Cc=(int)((a/b)*100000);
    if(cc==c || a/b==c || Cc==(int)(c*100000)) result[count]=1;
    else result[count]=2; 
}


int main()
{
char *str;
int *result;
result=(int*)malloc(100);
double a,b,c;
char ac,el=0;
int count=0;
int eof;
int ro=0;
for(;eof!=EOF;count++){
    eof=0;
    int k=0;
    str=(char*)malloc(100);
    int ind=0;
    for(int i=0;eof!='\n';i++){
        eof=getchar();
        if(eof==EOF) break;
        if(eof=='='){
            ro=1;
        }
        if(!isdigit(eof) && eof!='.' && eof!=' '){
            k++;
        }
        if(eof!=' '){
            str[ind]=eof;
            ind++;
        }
    }
    if(ro==0){
        printf("CHYBA\n");
        break;
    }
	if(eof==EOF) break;
    sscanf(str,"%lF%c%lF=%lF ",&a,&ac,&b,&c);
    free(str);
    if(k>3){
        result[count]=3;
        continue;
    }
    switch(ac){
        case '+':
            add(a,b,c,ac,result,count);
            break;
        case '-':
            subtr(a,b,c,ac,result,count);
            break;
        case '*':
            multi(a,b,c,ac,result,count);
            break;
        case '/':
            divi(a,b,c,ac,result,count);
            break;
        default:
        result[count]=3;
    }

}
    count--;
    for(int j=0;j<count;j++){
        if(result[j]==1) printf("OK\n");
        if(result[j]==2) printf("ZLE\n");
        if(result[j]==3) printf("CHYBA\n");
    }

    return 0;
}