Select the letter will replace the question mark (?) in the following series.

A, J, E, L, I, N, O, P, U, ?

R

Logic here is :

Every 3rd  Alphabet are correlated to each other  in such a way that within correlated alphabets vowels are inserted in series (A , E , I , O ,U )   .

A, J, E, L, I, N, O, P, U, ?

A(vowel) , J , E(vowel) , J + 2 = L , I(vowel) , L + 2 = N , O(vowel) , N + 2

= P , U (vowel) , P + 2 = R

Ans = R