#include <cstdio>
#include <string>
#include <iostream>
using namespace std;

string s;
int lit, nrcuv;
char bef;

int main()
{
    int i;
    freopen ("text.in", "r", stdin);
    freopen ("text.out", "w", stdout);
    getline(cin, s);
    for(i = 0; i < s.size(); ++i) {
        if((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z')) {
            ++lit;
            if(!((bef >= 'a' && bef <= 'z') || (bef >= 'A' && bef <= 'Z')))
                ++nrcuv;
        }
        bef = s[i];
    }
    cout << lit / nrcuv;
    return 0;
}