#include <fstream>
#include <iostream>
using namespace std;

int main()
{
    char c;
    int wcount = 0, length = 0;
    bool separator = false;
    ifstream f ("text.in");
    ofstream g ("text.out");
    while(f.get(c)){
        if(('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z')){
            length ++;
            separator = true;
        }
        else if (separator == true){
            wcount ++;
            separator = false;
        }
    }

    if(!length)
        g<<'0';
    else
        g<< length/wcount;

    f.close();
    g.close();
    return 0;
}