rottet alpha numeric and numbers placeses : i need to rottet the placess on numeric and alpha-numeric placess.

need to see first the alph-numeric and then the numeric.

for example:

    11AA
    20BA
    70D
    9SD

i need to get this:

    AA11
    BA20
    D70
    SD9

i try with reverse - but it not what i need....

    public static string Reverse( string s )
    {
        char[] charArray = s.ToCharArray();
        Array.Reverse( charArray );
        return new string( charArray );
    }


thanks