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

#define ll long long 
#define fisier 1
const int mxN = 2e5;

int32_t main(){
	#ifdef fisier
        ifstream cin("text.in");
        ofstream cout("text.out");
    #endif

	ios_base::sync_with_stdio(false);
	cin.tie(NULL); cout.tie(NULL);

	string s;
	getline(cin,s);
	int ans = 0, cuv = 1, litera = 0;
	for (char d : s){
		if ((d >= 65 && d<=90) || (d>= 97 && d <= 122)){
		ans++; litera++;
		}
		else {
			if (litera) cuv++;
			litera = 0;
		}
		
	}
	cout << ans / cuv;
	//cout << s.size();	
}