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

using namespace std;

int l, c, m, mm;
char s[1000500];

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

int main()
{
    int i;
    fin.getline(s, 1000500);
    l = strlen(s);
    for (i = 0; i < l; i++) {
        if (isalpha(s[i])) {
            c++;
            m = 0;
            while (isalpha(s[i])) {
                m++;
                i++;
            }
            mm += m;
        }
    }

    fout << mm / c;

    return 0;
}