import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
       int[] arr = {1,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,4,1,2,3,1,2,3,4};
        char[] c = sc.nextLine().toCharArray();
        int ans = 0;
        for (char temp : c) {
            //如果当前字符为空格，则ans加1
            if(temp==' ')ans++;
            //否则，ans加上arr中对应字符的值
            else{
                ans+=arr[temp-96];
            }
        }
        System.out.println(ans);
    }
}