#include<bits/stdc++.h>
using namespace std;
int main(){
    int a[27]={1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,4,1,2,3,1,2,3,4,1};
    char c;
    c=getchar();
    int key=26,sum=0;
    while(c!='\n'){
        key=c-'a';
        if(key<0){
            sum++;
        }
        else{
            sum+=a[c-'a'];
        }
        c=getchar();
    }
    cout<<sum;
    return 0;
}