import java.util.*;
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String prv = sc.next();
        String vtor = sc.next();
        String letters = sc.next();
        int[][] ceni = new int[letters.length() + 1][letters.length() + 1];
        for (int i = 0; i <= letters.length(); i++) {
            for (int j = 0; j <= letters.length(); j++) {
                ceni[i][j] = sc.nextInt();
            }
        }
        prv+=" ";
        vtor+=" ";
        Map<Character,Integer> mapa=new HashMap<>();
        mapa.put(' ',0);
        for (int i = 0; i < letters.length(); i++) {
            mapa.put(letters.charAt(i),i+1);
        }
        int num=Math.max(prv.length(),vtor.length())+1;
        int [][] dp=new int[num][num];
        dp[0][0]=ceni[0][0];
        for (int i = 1; i <=num ; i++) {
            int i1=Math.min(i,prv.length())-1;
            int i2=Math.min(i,vtor.length())-1;
            dp[i][0]=ceni[mapa.get(prv.charAt(i1))][0]+dp[i-1][0];
            dp[0][i]=ceni[mapa.get(prv.charAt(i2))][0]+dp[0][i-1];
        }
        int max=0;
        for (int i = 1; i <prv.length(); i++) {
            for (int j = 1; j < vtor.length(); j++) {
//                System.out.println(dp[i][j]+" ");
                dp[i][j]=Math.max(dp[i-1][j-1]+ceni[mapa.get(prv.charAt(i-1))][vtor.charAt(j-1)],dp[i-1][j]+ceni[mapa.get(prv.charAt(i-1))][0]);
                dp[i][j]=Math.max(dp[i][j],dp[i][j-1]+ceni[mapa.get(vtor.charAt(j-1))][0]);

            }
//            System.out.println();
        }
        System.out.println(dp[num][num]);
    }
}