HDU 2072 单词数

/* HDU 2072 单词数 --- stringstream+STL */
#include <cstdio>
#include <iostream>
#include <sstream>
#include <string>
#include <set>
using namespace std;

set<string> k;

int main()
{
string s;
while (getline(cin, s) && s != "#"){
k.clear();
stringstream str(s);
string tmp;
while (str >> tmp){
k.insert(tmp);
}
cout << k.size() << endl;
}//while(get)
}