alphabetic-game
Source: hackerearth
Difficulty: UNKNOWN_DIFFICULTY

Riya, Rajiv & Rohit are playing a game in which at once two of them write a single alphabetic letter on a piece of paper & the third person is supposed to write all the letter between this two letters in in proper alphabetic order except the vowels(a,e,i,o,u).

Suppose Riya & Rajiv write - A & J. Then Rohit should write- B,C,D,F,G,H.
the number should be separated by a comma(,) sign. 

NOTE- if the two people write the same letter then the output should be "NA".
Ex- if Riya and Rajiv both write A then output should be NA.

Also if  Rajiv write A & Riya Write J, the output should be the alphabets between A & J, not between J & A.

SAMPLE INPUT
A J

SAMPLE OUTPUT
B,C,D,F,G,H