#include <bits/stdc++.h>
using namespace std;
#define int long long int
#define double long double
#define print(a) for(auto x : a) cout << x << " "; cout << endl
const int M = 1000000007;
const int N = 3e5+9;
const int INF = 2e9+1;
const int LINF = 2000000000000000001;
inline int power(int a, int b, int mod=M) {
int x = 1;
a %= mod;
while (b) {
if (b & 1) x = (x * a) % mod;
a = (a * a) % mod;
b >>= 1;
}
return x;
}
//_ ***************************** START Below *******************************
vector<int> a;
int consistency(string s){
vector<int> f;
for(int i=0; i<s.size(); i++){
f.push_back(a[s[i]-'a']);
}
sort(begin(f), end(f));
int ans = 0;
for(int i=1; i<f.size(); i++){
ans += abs(f[i]-f[i-1]);
}
return ans;
}
int practice(string s){
return 0;
}
void solve() {
string s;
cin>> s;
a.resize(26);
for(int i=0; i<26; i++) cin >> a[i];
cout << consistency(s) << endl;
}
int32_t main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int t = 1;
// cin >> t;
while (t--) {
solve();
}
return 0;
}
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