/*
gcc -Werror -std=c11  -Wall  in-out.c   -lm   -o in-out -lm && ./in-out
*/
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include <math.h>

struct res{
    double na,nb,result;
    char sign;
}list [10];

int fill(double*,double*,char *,double *);
double count(const double*,const double *,char);
int aget(double *);
int sget(char *);
int efinde(void);
char checkend(void);

int main(){
    int cond;
    char fcond=1;
    int i;
    for(i=0;fcond!=EOF;i++){
        fcond=checkend();
        if(fcond==EOF)
           break;
        
        cond=aget(&list[i].na);
        if(cond<0){
            printf("CHYBA\n");
            return 0;}
        cond=sget(&list[i].sign);
        if(cond<0){
            printf("CHYBA\n");
            return 0;}
        cond=aget(&list[i].nb);
        if(cond<0){
            printf("CHYBA\n");
            return 0;}
        cond=efinde();
        if(cond<0){
            printf("CHYBA\n");
            return 0;}
        cond=aget(&list[i].result);
        if(cond<0){
            printf("CHYBA\n");
            return 0;}
        if((fcond=checkend())!='\n' && fcond>0){
            printf("CHYBA\n");
            return 0;}
        if(fcond==-1)
            break;
        //printf("%lf %c %lf = %lf\n",list[i].na,list[i].sign,list[i].nb,list[i].result);
    }
    for(int x=0;x<i;x++){
        double fin=count(&list[x].na,&list[x].nb,list[x].sign);
        //printf("%lf %lf\n",fin,list[x].result);
        if((long)(fin*1000000)!=(long)(list[x].result)*1000000){
            printf("ZLE\n");
            return 0;
        }
    }
    printf("OK\n");
    
}
char checkend(void){
    char c;
    int count=1;
    c=getchar();
    while((c=getchar())){
        ++count;
        if(c==EOF || c=='\n'){
            int a=c;
            if((c=getchar())==EOF){
                ++count;
                fseek(stdin,-count,SEEK_CUR);    
                return c;
            }
            ++count;
            fseek(stdin,-count,SEEK_CUR);
            return a;
        }
        else if(!isspace(c)){
            fseek(stdin,-count,SEEK_CUR);
            return c;
        }
    }
    return -2;
}
double count(const double*na,const double *nb,char sign){
    
    if(sign=='+')
        return *na+*nb+0.00000000001;
    else if(sign=='-')
        return *na-*nb;
    else if(sign=='*')
        return *na*(*nb);
    else if(sign=='/')
        return *na/(*nb);
    
    return -1;
}

int aget(double *na){
    char a[30];
    char c;
    char *p;
    p=a;
    while(isspace(c=getchar()));
    if(isdigit(c)){
        *(p++)=c;
        while(isdigit(c=getchar())|| c=='.') *(p++)=c;
        *p='\0';
        *na=atof(a);
    }else
        return -1;
    fseek(stdin,-1,SEEK_CUR);
    return 1;
}
int sget(char *sign){
    char c;
    while(isspace(c=getchar()));
    if(c=='+' || c=='-' || c=='/' || c=='*')
       *sign=c;
    else
        return -1;
    return 1;
}
int efinde(void){
    char c;
    while(isspace(c=getchar()));
    if(c!='=')
        return -1;
    return 1;
}