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

int call( double A,  double B,  double C, char AC){
     double cC=(double)C;
    if(AC=='/'&&B==0 || AC==('+'||'-'||'*'||'-')){
        return printf("CHYBA\n");
    }
    else if(AC=='+'){
        if(A+B==C || C==cC)return printf("OK\n");
        return printf("ZLE\n");
    }
    if(AC=='-'){
        if(A-B==C)return printf("OK\n");
        return printf("ZLE\n");
    }
    if(AC=='*'){
        if(A*B==C)return printf("OK\n");
        return printf("ZLE\n");
    }
    if(AC=='/'){
         double Cc=A/B;
        Cc=(int)(Cc*100000);
        Cc=(float)Cc/100000;
        if(Cc==C || A/B==C)return printf("OK\n");
        printf("\n%f\n%f",Cc,A/B);
        return printf("ZLE\n");
    }
    return printf("CHYBA\n");
}

int main()
{
char *str;
str=(char*)malloc(100);
 double a,b,c;
char ac,el;
int ind=0;
for(int i=0;el!='\n';i++){
    el=getchar();
    if(isspace(el)){
        continue;
    }
    str[ind]=el;
    ind++;
}
//134.5␣/␣6.7␣=␣20.07462686567164
//scanf("%s",str);
sscanf(str,"%lF%c%lF=%lF ",&a,&ac,&b,&c);
//printf("\n%Lf %c %Lf =%Lf ",a,ac,b,c);
call(a,b,c,ac);
    return 0;
}