#include <bits/stdc++.h>

using namespace std;

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

string s, letters = "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm";
int medie,cate,i,poz;

int main()
{
    getline(f, s);
    while(1)
    {
        poz = s.find_first_of(letters);
        if(poz != string::npos)
        {
            s = s.substr(poz);
            i = 0;
            while(letters.find_first_of(s[i]) != string::npos && i < s.size())
                ++ i;
            medie += i;
            ++ cate;
            s = s.substr(i);
        }
        else
            break;
    }
    g << medie / cate;
}