#include <iostream>
#include <cstring>
#include <fstream>

using namespace std;

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

char v [5000000];

int main ()
{
    fin.getline(v, 5000000);
    int n = strlen(v), i, lun = 0, cuv = 0;
    i = 0;

    while (v[i] != '\0')
    {
        if (isalpha(v[i]))
        {
            cuv++;
            while (isalpha(v[i]))
            {
                lun++;
                i++;
            }
        }
        i++;
    }

    fout << lun / cuv;
    return 0;
}