Andy‘s First Dictionary UVA - 10815

#include<cstdio>
#include<cstring>
#include<iostream>
#include<sstream>
#include<algorithm>
#include<set>
using namespace std;
set<string> word;
int main()
{
	
	string a,b;
	while(cin>>a)
	{
		for(int i=0;i<a.size();i++)
		{
			if(isalpha(a[i]))a[i]=tolower(a[i]);else a[i]=' ';
			
		}
		stringstream ss(a);
		while(ss>>b)word.insert(b);
		
	}
	for(set<string>::iterator it=word.begin();it!=word.end();++it)
	{
		cout<<*it<<endl;
	}
	return 0;
}