PALIN attempt
PALIN attempt #2

Use bufio, since fmt.Scan is not buffered and thus is slow.  This is noticeably
faster, but not fast enough.
PALIN attempt #3

Reduce conversions from strings to big.Int and use bufio for output.  Both
reduce runtime significantly, but this isn't fast enough.
PALIN attempt #4

Add optimized Greater() function.  This is faster than creating big.Ints and
using Cmp, but still not fast enough.
PALIN attempt #5

More replacing big.Int with String implementation.  Gives a wrong answer, even
though I think I have all the cases covered and they pass.  Time to rewrite in
C++.
JULKA solution