#include <bits/stdc++.h>

using namespace std;

char s[10485760];
long long n, k;

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");

    f.get(s, 10485760);
    s[strlen(s)] = '1';

    for(int i = 0; i <= strlen(s); i ++) {
        if(('A' <= s[i] && s[i] <= 'Z') || ('a' <= s[i] && s[i] <= 'z')) {
            k ++;
            while(('A' <= s[i] && s[i] <= 'Z') || ('a' <= s[i] && s[i] <= 'z'))
                n ++, i ++;
        }
    }
    g << n / k << "\n";
    return 0;
}