#include <bits/stdc++.h>
using namespace std;
string s;
int ans=0;
int main()
{
	getline(cin,s);
	for(int i=0;i<;i++)
	{
		cin>>s[i];
		if(s[i]=='\n')
		{
			break;
		}
		if(s[i]==' ' || s[i]=='a' || s[i]=='d' || s[i]=='g' || s[i]=='j' || s[i]=='m' || s[i]=='p' || s[i]=='t' || s[i]=='w')
		{
			ans+=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')
		{
			ans+=2;
		}
		else if(s[i]=='z' || s[i]=='s')
		{
			ans+=4;
		}
		else
		{
			ans+=3;
		}
	}
	cout<<ans;
	return 0;
}
//so 美丽