import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.*;
/* Name of the class has to be "Main" only if the class is public. */
class Main
{
private static final int N = 26;
private static int n;
private static int m;
private static int p;
private static int[] a = new int[N];
for (int i = 0; i < N; i++) {
a[i] = 0;
}
Scanner sc
= new Scanner
(System.
in); n = sc.nextInt();
m = sc.nextInt();
p = sc.nextInt();
s = sc.nextLine();
for (int i = 0; i < n; i++) {
s = sc.nextLine();
for (int j = 0; j < s.length(); j++) {
a[(int)(s.charAt(j) - 'A')]++;
}
}
for (int i = 0; i < p; i++) {
s = sc.nextLine();
for (int j = 0; j < s.length(); j++) {
a[(int)(s.charAt(j) - 'A')]--;
}
}
for (int i = 0; i < N; i++) {
for (int j = 0; j < a[i]; j++)
System.
out.
print(""+(char)('A' + i
)); }
}
}
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