安迪的第一个字典（Andy's First Dictionary，Uva 10815）

输入一个文本，找出所有不同的单词（连续的字母序列），按字典序从小到大输出。单词不区分大小写。

样例输入：

Adventures in Disneyland

Two blondes were going to Disneyland when they came to a fork in the

road. The sign read: 'Disneyland Left.'

So they went home.

样例输出（为了节约篇幅只保留前5行）：

a

adventures

blondes

came

disneyland

#include<iostream>
#include<cstdio>
#include<vector>
#include<string>
#include<set>
#include<sstream>
using namespace std;
set<string> dict;
int main()
{
	string str, buf;
	while(cin >> str)
	{
		for (int i = 0; i < str.length(); i++)
		{
			if (isalpha(str[i]))
				str[i] = tolower(str[i]);
			else
				str[i] = ' ';
		}
		stringstream ss(str);
		while (ss >> buf)
			dict.insert(buf);
	}
	for (set<string>::iterator it = dict.begin(); it != dict.end(); ++it)
		cout << *it << endl;
	system("pause");
	return 0;
}