uva 10815 Andy's First Dictionary

#include <iostream>
#include <stdio.h>
#include <set>
#include <string>
#include <cstring>
using namespace std;
int main()
{
char word[1000];
set<string> adj;
while(gets(word))
{
string key="";
int len=strlen(word);

for(int i=0;i<len;i++)
{
if(isalpha(word[i]))
{
key+=tolower(word[i]);
}
else
{
if(key!="") adj.insert(key);
key="";
}
}
if(key!="") adj.insert(key);
}
set<string>::iterator it;
for(it=adj.begin();it!=adj.end();it++) printf("%s\n",(*it).c_str());
return 0;
}