Derive the logic used to produce the desired output. It's Reverse Coding

INPUT:

A single integer t representing test cases

Next t lines, A integer x, and string s where x is the length of the string

OUTPUT:

t lines, one string per line.

(Hint: Choose through parity, it makes all the difference. Also , my mom said the try to make a difference within yourself, rather than comparing with others. Also , the title is also an hint . )

CONSTRAINTS:

t < 1000

1 <= x <= 1000