#include <bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");


char a[10000000];
int main()
{
    int i;
    fin.getline(a, 10000000);
    int ltot = 0, nrcuv = 0;
    for(i = 0;a[i];)
    {
        if((a[i] <= 'z' && a[i] >= 'a') || (a[i] <= 'Z' && a[i] >= 'A'))
        {
            int x = 0;
            nrcuv++;
            while ((a[i] <= 'z' && a[i] >= 'a') || (a[i] <= 'Z' && a[i] >= 'A'))
            {
                i++;
                x++;
            }
            ltot += x;
        }
        else
            i++;
    }
    fout << ltot / nrcuv;
    return 0;
}