#include<bits/stdc++.h>
using namespace std;
string s;
int a[26]={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};
int ans;
int main() {
	getline(cin,s);
	for(int i=0;i<s.length();i++){
		if(s[i]==' '){
			ans++;
		}
		else{
			ans+=a[s[i]-'a'];
		}
	}
	cout<<ans;
	return 0;
}