#include <iostream>
using namespace std;

int is_letter(char c) {
	if ((int) c >= 65 && (int) c <= 122) {
		return 1;
	} else {
		return 0;
	}
}

int main () {
	char a, b, c;
    
    cin >> a >> b >> c;

    cout << is_letter (a) +  is_letter (b) + is_letter(c);
}