#include <bits/stdc++.h>

using namespace std;
 
ifstream cin("text.in");
ofstream cout("text.out");
 
int words;
int letters;
 
int main()
{
	char c;
	int prev = 0;
	
	while(cin.get(c))
	{
		if(isalpha(c))
		{
			if(prev == 0)
				words++;
			letters++;
			prev = 1;
		}
		else
			prev = 0;
	}
	
	words += prev;
	
	cout << letters / words;
}