#include <bits/stdc++.h>
using namespace std;

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

char s[1000005];
int nrlitere, nrcuv;

int main()
{
    in.get(s, 1000005);
    int n = strlen(s);
    for (int i = 0; i < n; ++i)
        if (((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z')))
        {
            while ((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z'))
            {
                ++nrlitere;
                ++i;
            }
            ++nrcuv;
        }
    out<<nrlitere / nrcuv;
    return 0;
}