uva10815

#include <iostream>
#include <set>
#include<sstream>
#include<string>
using namespace std;
set<string> dict;
int main()
{
    string temp,result;
    while(cin>>temp)
    {
        for(int i=0;i<temp.length();i++)
            {
                if(isalpha(temp[i]))
                    temp[i]=tolower(temp[i]);
                else
                    temp[i]=' ';
            }
            stringstream ss(temp);
            while(ss>>result)
                dict.insert(result);
    }
    for(set<string>::iterator p=dict.begin();p!=dict.end();p++)
    {
        cout<<*p<<endl;
    }
    return 0;
}