Sorry but I don't know how to deal big number.
Here's another CODY problem that deals with something similar:
Project Euler: Problem 4, Palindromic numbers
Compute a dot product of two vectors x and y
Set the array elements whose value is 13 to 0
Calculate the Hamming distance between two strings
Area of an equilateral triangle
How Far Can You Throw Something?
With apologies to William Blake
It's Happy! It's Fun! It's Happy Fun Hyperball!
How many days?!?
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