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

using namespace std;

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

int nr_cuv, nr_lit;
bool ok;

char sir[1000];

int main()
{
	int i,x;
	f.getline(sir,1000);
	x = strlen(sir);
	for(i = 0; i < x; i++) {
		if((sir[i] <= 'z' && sir[i] >= 'a') || (sir[i] <= 'Z' && sir[i] >= 'A')) {
			nr_lit++;
			if(!ok) {
				nr_cuv++;
				ok = 1;
			}
		} else {
			ok ^= ok;
		}
	}
	g<<nr_lit / nr_cuv;
}