1 #include <iostream>
 2 #include <sstream>
 3 #include <string>
 4 #include <set>
 5 
 6 using namespace std;
 7 
 8 set<string> dict;
 9 
10 int main()
11 {
12     string s,buf;
13 
14     while(cin>>s)
15     {
16         for(unsigned int i=0;i<s.length();i++)
17         {
18             if(isalpha(s[i]))
19                 s[i]=tolower(s[i]);
20             else
21                 s[i]=‘ ‘;
22         }
23 
24         stringstream ss(s);
25 
26         ss >> buf; 
27         dict.insert(buf);
28     }
29 
30     for(set<string>::iterator it=dict.begin();it!=dict.end();it++)
31         cout<<*it<<endl;
32 
33     return 0;
34 }