#include<iostream>
#include<fstream>
#include<stdio.h>

using namespace std;

ifstream fin("text.in");
ofstream out("text.out");

int main() {

	
	char c;
	int len = 0, cuv = 0;
	while (fin.get(c)) {
		if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
		{
			len += 1;

		}
		
		else if (c == ' ') {
			cuv++;
		}


	}
	out<<len /cuv;


	return 0;

}