#include <iostream>

using namespace std;

int main()
{
 int age;
 
 cout<<"Please input your age: ";
 cin>> age;
 cin.ignore();
 if ( age < 100 ) {
  cout<<"you're young!.\n";
 }
 else if ( age == 100 ) {
  cout<<"you're old!.\n";
 }
 else {
  cout<<"You're really old!\n
  }
  cin.get();
 }