/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		char[] charArray1 = new char[]{'A','B','C','D'};
        char[] charArray2 = new char[]{'1','2','3','4','5','6','7'};
 
 
		int j = 0;
		for(int i = 0; i < charArray2.length; i++)
		{   
		    char keyChar = charArray1[j];
 
		    j++;
		    if(j == charArray1.length)
		        j=0;
 
		    char messageChar = charArray2[i];
 
		    System.out.print(keyChar);
            System.out.println(messageChar);
		}
	}
}

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