Decode This!

 

 

Using this key, decode the following message

 
A - 6 B - 12 C - 9 E - 8
H - 2 I - 10 K - 4 O - 7 P - 3
R - 5 S - 1 T - 11 U - 13

 
   __ __ __     __ __ __ __     __ __     __ __ __     __ __ __ __ !   
    7 13  5      3  6  9  4     10  1     11  2  8     12  8  1 11