import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        int ans = 0;
        for (int i = 0; i < str.length(); i++) {
            ans += solve(str.charAt(i));
        }
        System.out.println(ans);
    }
    public static int solve(char key){
        switch (key){
            case 'a' :
            case 'g' :
            case 'j':
            case 'd' :
            case 'm':
            case 'p':
            case 't':
            case 'w':
            case ' ':
                return 1;
            case 'b' :
            case 'e' :
            case 'h' :
            case 'k':
            case 'n':
            case 'q':
            case 'u':
            case 'x':
                return 2;
            case 'c':
            case 'i':
            case 'f' :
            case 'l':
            case 'o':
            case 'r':
            case 'v':
            case 'y':
                return 3;
            case 's':
            case 'z':
                return 4;
            default:
                return 0;
        }
    }
}