#include<iostream>
#include<fstream>

using namespace std;

ifstream in("intrare.txt");
ofstream out("iesire.txt");

char c;
int nr , t ;
bool ok ;


int main()
{
	

	while (in.get(c))
	{
		if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
		{
			if (ok == false)
			{
				ok = true;
				nr++;
			}
			
			t++;
		}
		else
			ok = false;
	}

	
	if(nr!=0)
		out << t / nr;

	
	return 0;
}