/* package whatever; */

import java.util.*;
import java.lang.*;
import java.io.*;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String s = "ABCDEmasterbbbbbbb123";
		int j = -1;
		for (int i = 0; i < s.length(); i++) {
			char c = s.charAt(i);
			c += j;
			j = -j;
			System.out.print(c);
        }
        System.out.println();
	}
}