#include<bits/stdc++.h>
using namespace std;
int main(){
	int arr[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};
	char s;
	int ans = 0;
	while(1){
		s = getchar();
		if(s==EOF){
			break; 
		}
		else if(s==' '){
			ans+=1;
		}
		else{
			ans += arr[int(s-'a')];
		}
		
	}
	cout<<ans;
	return 0;
}