#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 check(char *str){ 

int flag=0; 

char symb[5]="*-+/="; 

for(int i =0;i<strlen(str);i++){ 

for(int k =0;k<5;k++){ 

for(int j =0;j<5;j++){ 

if(str[i]==symb[j]&&str[i+1]==symb[k]){ 

return 0; 

} 

} 

} 

if(str[i]=='='){ 

flag=1; 

} 

if((str[i]>='a'&&str[i]<='z')||(str[i]>='A'&&str[i]<='Z')||str[i]==','){ 

return 0; 

} 

} 

return flag==1?1:0; 

} 

int main() 

{ 

char str[100][100]; 

 for(int i =0;fgets(str[i],100,stdin);i++){ 

  if(str[i][0]=='\n'){ 

  break; 

  } 

 char *new_str = compactString(str[i],strlen(str[i])); 

 double first =-5,second =-5,res=-5; 

 char c='E'; 

 sscanf(new_str,"%lf%c%lf%*[=]%lf",&first,&c,&second,&res); 

 if(c!=43&&c!=42&&c!=45&&c!=47||check(new_str)==0){ 

  printf("CHYBA\n"); 

 continue; 

 } 

 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; 

}