#include <fstream>
#include <string>
#include <iostream>

using namespace std;

int main()
{
	ifstream in("text.in");
	ofstream out("text.out");
	
	string s;
	
	getline(in, s);
	
	int cnt = 0;
	
	for(int i = 0; i < s.size(); ++i)
		if((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z'))
			++cnt;
		
	int nr = 0, start = false;
	
	for(int i = 0; i < s.size(); ++i)
	{
		if(((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z')))
		{
			start = true;
		}
		else
		{
			if(start == true) 
				++nr;
			start = false;
		}
	}
	
	if(start == true)
		++nr;
		
	out << cnt / nr;
	
	
	return 0;
}