class Ideone
{
	public static void main (String[] args)
	{
		String s1 = "MOC.OOHAY@ABC.PQRqwertySDdd";
	    String s2 = "MOC.OOHAY@AB.JKLasDDbfn";
	    String s3 = "MOC.OOHAY@XZ.JKGposDDbfn";
	    System.out.println(s1.split("[a-z]", 2)[0]);
	    System.out.println(s2.split("[a-z]", 2)[0]);
	    System.out.println(s3.split("[a-z]", 2)[0]);
	}
}