#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
string S;
int sum,num;
int main(){
	ifstream cin("text.in");
	ofstream cout("text.out");
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	while(!cin.eof()){
		getline(cin,S);
		for(int i = 0;i<S.length();i++){
			if((S[i] >= 'a' && S[i] <='z') || (S[i] >= 'A' && S[i] <='Z')){
				sum++;
				if(i+1 == S.length() || !((S[i+1] >= 'a' && S[i+1] <='z') || (S[i+1] >= 'A' && S[i+1] <='Z'))) num++;
			}
		}
	}
	cout << (num ? sum/num : num);
    return 0;
}