UVa 494 Kindergarten Counting Game

Code:
#include<stdio.h>
#include<stdlib.h>
#include<iostream>
#include<algorithm>
#include<math.h>
using namespace std;
int main()
{
   string str;
   while(getline(cin,str))
   {
       int len=str.size();
       int num=0;
       bool first=true;
       for(int i=0;i<len;i++)
       {
           if((str[i]<='Z'&&str[i]>='A')||(str[i]<='z'&&str[i]>='a'))
           {
               if(first) num++,first=false;
           }
           else  first=true;
       }
       cout<<num<<endl;
   }
    return 0;

}

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