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

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

int sum;
string text;
char *pointer;

int main() {
	getline(f, text);
	int length = text.length(), i = 0, no = 0, sum = 0;
	const char *pointer = text.c_str();

	while(i < length)
	{
		if(isalpha(pointer[i]))
			no++;
		while(isalpha(pointer[i]))
		{
			sum++;
			i++;
		}
		i++;
	}

	g << sum / no;
	f.close();
	g.close();
	return 0;
}