#include <bits/stdc++.h>

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

bool alpha(char s){
    if(s >= 'a' && s <= 'z')
        return true;
    if(s >= 'A' && s <= 'Z')
        return true;
    return false;
}

void solve(){
    int nrCuv = 0, nrL = 0, nrT = 0;
    char c;

    while(fin.get(c)){
        if(alpha(c))
            nrL++;
        else {
            if(nrL)
                nrCuv++;
            nrT += nrL;
            nrL = 0;
        }
    }

    fout << nrT / nrCuv;
}

int main()
{
    solve();

    return 0;
}