pick last two char from sring

Hi,

I have string which may vary in length; and i have to pick only last two char;

example: ABCDE  then pick DE

              XYZ then pick YZ

              PQ then just pick PQ        

is only UDF can help me? the substring doesnt work for this. I mean This is standard requirement. is there any way we can achive this using standrad functions?   

Thanks.