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

char c, l = '0';
int total, nr;

bool check(char x){
    return ((x >= 'a' && x <='z') || (x>='A' && x<='Z'));
}
int main(){
    ifstream cin ("text.in");
    ofstream cout ("text.out");
    while (cin >> noskipws >> c){
        if (check(c) && !check(l)) nr++;
        if (check(c)) total++;
        l = c;
    }
    cout << total/nr;
    return 0;
}