You have two strings, a and $b.$ Find a string, s$,$ such that: substring af b$.$

s is a palindromic sinis$.$

The length of s is as lorg as possible.

For each of the $q$ pairs of strings $,$ and $($:$b_1\}$ fetencd as inpu, find and pent gring $A_1$ on a new lne$,$ if you'te able to form more than one vald string $x_4$ print whichever one comes first aphabetically if there is no valid answer, print $-1$ rntead.

input Format: aiatry over two lnes:

$2$ the shesend lire contans a singie waring decoting $b$

Constraints

$*1|a|,|6|11$

a ane b contain only bowercace frigithi intien.

Sum of $|$a$|$ aver al que

res does nec exreed $2={10}^{\text{'}\text{'}}$

give code in c$++$