#include<bits/stdc++.h>
using namespace std;
int a[30]={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},k;
int main(){
	string s;
	getline(cin,s);
	for(int i=0;i<s.size()-1;++i){
		if(s[i]==' '){
			k++;
		}else{
			k+=a[s[i]-97]; 
		}
	}
	printf("%d",k);
	return 0;
}