import java.io.*;
import java.util.*;
class Main {
public static void main(String[] args) {
char[] a = {'a', 'b', 'c', 'd'};
char[] b = {'b', 'c', 'a', 'e', 'd'};
int one = a.length;
int two = b.length;
int total = 0;
for(int i = 0; i < one; i++) {
total += a[i];
}
int total2 = 0;
for(int j = 0; j < two; j++) {
total2 += b[j];
}
int integer = total2-total;
char character = (char) integer;
System.out.print(character);
}
}