#include<iostream>
#include<string>
#include<cstdio>
#include<map>
using namespace std;
int main()
{
char ch;
string str="";
map<string,bool>Dict;
//freopen("in.txt","r",stdin);
while(scanf("%c",&ch)==1)
{
ch=ch|32;
if(ch>=97&&ch<=122)
str=str+ch;
else
{
if(str!="")
Dict[str]=true;
str="";
}
}
map<string, bool>::iterator iter;
for (iter=Dict.begin();iter!=Dict.end();++iter)
cout<<iter->first<<endl;
return 0;
}
#include<string>
#include<cstdio>
#include<map>
using namespace std;
int main()
{
char ch;
string str="";
map<string,bool>Dict;
//freopen("in.txt","r",stdin);
while(scanf("%c",&ch)==1)
{
ch=ch|32;
if(ch>=97&&ch<=122)
str=str+ch;
else
{
if(str!="")
Dict[str]=true;
str="";
}
}
map<string, bool>::iterator iter;
for (iter=Dict.begin();iter!=Dict.end();++iter)
cout<<iter->first<<endl;
return 0;
}
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