#include<bits/stdc++.h>
using namespace std;
int main()
{
    string b;
    string a ="abcdefghijklmnopqrstuvwxyz";
    char ss;
    int p,q,i,j,k,sum;
    vector <pair <char,int> > v;
    int n=a.size();
    cin>>b;
    for (i=0;i<n;i++)
    {
        scanf("%d",&p);
        ss=a[i];
        v.push_back({ss,p});
    }
    int s=v.size();
    q=b.size();
    sum=0;
    for (j=0;j<q;j++)
    {
        for (i=0;i<s;i++)
        {
            if (v[i].first==b[j])
            {
                sum=sum+v[i].second;
            }
        }
    }
    printf("%d\n",sum);

}