#include <stdio.h> 
void main () 
{ 
 char x; 
 printf("enter tav"); 
 x=getchar(); 
 switch(x) { 
  case "":printf("good");break; 
  case "{":printf("good");break; 
  case "}":printf("good");break; 
  case "<":printf("good");break; 
  case ">":printf("good");break; 
  case "(":printf("good");break; 
  case ")":printf("good");break; 
  default:printf("error"); 
 } 
}