The current 32 and 64 bit machines can represent integers of around 9 digits and 30 digits respectively, while various scientific and mathematical applications have to represent integers as large as 200 to 300 digits. Implement a class that can store and manipulate arbitrarily large signed integers of length up to 200 digits. You can either store the integers either in arrays of integer, char or bits. You need to provide contractors for creating these integers via strings. Your class also supports the addition or subtraction for this class either by defining functions or operators overload.

Input/ Output Requirements: There is one input file for this problem, which contains the two integers by a blank line in between. The third line contains the operation need to perform on these integers. The output file will only represent the result of the operation.