#include <fstream>
#include <iostream>

using namespace std;

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

int main(){
	string s;
	int c = 0, l = 0, i, isword;
	
	while(getline(in, s)){
		i = 0, isword = 0;
		
		while(i < s.size()){
			if((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z')){
				l++;
				
				if(isword == 0){
					isword = 1;
					c++;
				}
			}
			else{
				isword = 0;
			}
			
			i++;
		}
	}
		
	out << l / c;
	
}