#include<bits/stdc++.h>
using namespace std;
int main(){
//	freopen("in.txt", "r", stdin);
//	freopen("out.txt", "w", stdout);
	string s;
	int sum=0;
	getline(cin,s);
	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;
		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;
		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;
		if(s[i]=='s'||s[i]=='z')sum+=4;
	}
	cout<<sum;
	return 0;
}