#include <iostream>
//#include <string>
#include <string.h>
using namespace std;


int count_words(string s)
{
    int words=0;
    int i = 0;
    int l = s.length(); 
    while (i < l )
    {
        while ( (i < l)  && (s[i] != ' ')  )
        {
          i++;
        }
        words++;
        i++;
    }
    return words;

}

   int main()

{
        int y;
        string s;
        cout << "Please input a sentence: ";
        getline(cin, s);
        cout << "Number of words in the sentence: " << count_words(s) << endl;

       //system("pause");
       return 0;

}