In the following Letter series, each letter gets the numerical value based on its position in the following arrangement such as | for M, 2 for K, 4 for I and so on
M K K I D N E T T Q O B F H A A G T U U X W L S R I
The sum of values of OB is exactly equal to which of the following?
1. N
2. K
3. U
4. L