高中 a011: 幼稚園的算數遊戲

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#include <iostream>
using namespace std;

int main (){
    string input ;
    while(getline(cin,input))
    {
        int word = 0 , flag = 0;
        for(int i = 0 ; i <= input.length() ; i++)
        {
            if((input[i] >= 'A' && input[i] <= 'Z') || (input[i] >= 'a' && input[i] <= 'z'))
                flag = 1 ;
            else
            {
                if(flag==1)
                {
                    word++ ;
                    flag = 0 ;
                }
            }
        }
        cout << word << endl ;
    }
}