#include <bits/stdc++.h>
using namespace std;
int main() {
	string s;
	cin >> s;
	int sum = 0;
	for (int i = 1; i <= s.size(); i++) {
		if (s[i] == 'a' || s[i] == 'd' || s[i] == 'g' || s[i] == 'j' || s[i] == 'm' || s[i] == 'p' || s[i] == 't'
		        || s[i] == 'w' || s[i] == ' ')
			sum += 1;
		else if (s[i] == 'b' || s[i] == 'e' || s[i] == 'h' || s[i] == 'k' || s[i] == 'n' || s[i] == 'q	' || s[i] == 'u'
		         || s[i] == 'x')
			sum += 2;
		else if (s[i] == 'c' || s[i] == 'f' || s[i] == 'i' || s[i] == 'l' || s[i] == 'o' || s[i] == 'r	' || s[i] == 'v'
		         || s[i] == 'y')
			sum += 3;
		else if (s[i] == 'z' || s[i] == 's')
			sum += 4;
	}

	cout << sum;
	return 0;
}