#include<iostream>
#include<string>
#include<set>
#include<sstream>
using namespace std;
set<string> dict;
int main()
{
#ifdef local
	freopen("pro.in","r",stdin);
#endif 
	string s,buf;
	while(cin>>s)
	{
		for(int i=0;i<s.size();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 0;
}