#include <iostream>
#include <string.h>
#include <fstream>

using namespace std;

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    char x;
    int c = 0;
    int c1 = 0;
    int cuv = 0;
    while(f.get(x)){
        if(isalpha(x)){
            c++;
        }
        else
            if(c > 0){
                ++cuv;
                c1 += c;
                c = 0;
            }
    }
    g<<c1 / cuv;
    return 0;
}