You are given an int N. The factorial of N is defined as N*(N-1)*(N-2)*...*1. Compute the factorial of N and remove all of its rightmost zero digits. If the result is more than K digits long, return the last K digits as a string. Otherwise, return the entire result as a string.
|-||N will be between 1 and 20, inclusive.|
|-||K will be between 1 and 9, inclusive.|