Sorry but I don't know how to deal big number.
Here's another CODY problem that deals with something similar:
Similar Triangles - find the height of the tree
letter yes yes & letter no no
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Given area find sides
Should Mr McNugget even get out of bed today?
Pandigital Multiples of 11 (based on Project Euler 491)
How brilliant are you?
Decimation - Optimized for speed
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