// input checker

#include <cassert>
#include <iostream>
using namespace std;
int main(){
  int n;
  cin >> n;
  assert(1<=n && n<=10);

  for(int i=0; i<n; i++){
    string s;
    cin >> s;
    for(auto c : s){
      assert( ('a'<=c && c<='z') );
    }
    assert( 1 <= s.size() && s.size() <= 20);
  }

  cerr << "ok" << endl;
  return 0;
}