Lengthen It!

A sequence of numbers is called a good sequence if it forms an increasing consecutive sequence of integers. For eg, $[5]$, $[-3, -2, -1]$ and $[9,10,11]$ are good sequences whereas $[2,4]$, $[3,2,1]$ and $[5,7,6]$ don’t form good sequences. A subsequence of an array is the sequence obtained by removing some, possibly all number of the elements from the array. For array $A=[2,3,4,5,6]$, $[2,5,6]