#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");

char s[256];

int main() {
	cin.getline(s, 256);
	int litere = 0;
	int cuvinte = 0;
	for (int i = 0; s[i]; ++i) {
		if (strchr("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", s[i]) != NULL)
			litere++;
		else if (strchr("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", s[i]) == NULL && s[i + 1] != ' ')
			cuvinte++;
	}
	cout << litere / cuvinte;
	return 0;
}