#include <iostream>
#include <cctype>
using namespace std;
int main()

{
	char input;
	cout<<"Enter any character: ";
   	cin.get(input);

   	if (isdigit(input))
   		cout<<"digit";
   		
   	else if (isalpha(input))
   		cout<<"letter";
   		
   	else
   		cout<<"special character";
   		
   	return 0;

}