Problem Statement  
You are given an int N. The factorial of N is defined as N*(N1)*(N2)*...*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.  
Definition  
 
Constraints  
  N will be between 1 and 20, inclusive.  
  K will be between 1 and 9, inclusive.  
Examples  
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