#include <iostream>

#include <string>

#include <set>

#include <sstream>

using namespace std;

set<string> dict;//string集合

int main()

{

    string s,buf;

    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) dict.insert(buf);

    }

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

    cout<<*it<<endl;

    return ;

}