#include <bits/stdc++.h>
using namespace std;
int main(int argc, char const *argv[])
{
	std::vector<int> al(26,0);
	for (int i = 0 ; i < 26 ;i++)
		cin >> al[i];
	int ans = 0;
	string str;
	while (cin >> str)
	{
		int MaxH = 0;
		for (int  i = 0 ; i < str.length();i++)
			MaxH = max (MaxH , al[str[i]-'a']);
		ans += MaxH * str.length();
	}
	cout << ans;
		return 0;
}