Sorry but I don't know how to deal big number.
Here's another CODY problem that deals with something similar:
Summing Digits within Text
Find the sum of the elements in the "second" diagonal
mathematics , probability problem
Converting numbers back from extended form
Should Mr McNugget even get out of bed today?
I've got the power! (Inspired by Project Euler problem 29)
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Go to the head of the class!
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