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

using namespace std;

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

int main()
{
	int  aux=0,c=1, lm=0;
	char a;
	
	while (fin>> noskipws>> a) {
	
			if (a == ' ') {
				c++;
			}
			if ((a<=90 && a>=65) || (a>=97 && a<=122))  {
				aux++;
			}
		
	}

	lm = aux / c;
	fout << lm<<" ";
	return 0;
}