#include <bits/stdc++.h>

using namespace std;

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

char v[300000];

int main()
{
    int nr = 0, nrc = 0;
    bool ok = false;

    while(fin >> v) {
        for(int i = 0; i < strlen(v); i++) {
            if(isalpha(v[i]))
                nr++, ok = true;
            else {
                if(ok) nrc++, ok = false;
            }
        }

        if(ok) nrc++;

        ok = false;
    }

    fout << nr / nrc;

    return 0;
}