#include<iostream>

#include<string>

#include<set>

#include<sstream>

using namespace std;

set<string> dic;

string s, buf;

int main() {

  while(cin >> s) {

    for(int i = ; i < s.length(); i++)

      if(isalpha(s[i])) s[i] = tolower(s[i]); else s[i] = ' ';

    stringstream ss(s);

    while(ss >> buf) dic.insert(buf);

  }

    for(set<string>::iterator it = dic.begin(); it != dic.end(); ++it)

    cout << *it << "\n";

  return ;

}