If it is possible to form a word with the first, fourth, seventh and eleventh letters in the word 'SUPERFLUOUS', write the first letter of that word. Otherwise, X is the answer.
The following question is based on the following alphabet series. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
If the letters of the given alphabet interchange positions, so that A takes the place of Z and Z takes the place of A; B takes the place of Y and Y takes the place of B and so on, what will be the thirteenth letter from the right ?