We consider the sequence of numbers in which a number is followed by the same number plus the sum of these digits.

For example 34 is followed by 41 (41 = 34 + ( 3+4)) . 41 is also followed by 46 ( 46 = 41 + ( 4 +1 )).

Two sequences with different starting points can end up joining. for example the sequence that starts at 471 and the sequence that starts at 480 share the number 519 (the join point). Obviously after the join point, the sequences are identical.

Implement in python the compute_join_point( s_1 , s_2 ) function which takes the starting points of two sequences and returns the join point of these two sequences.

Constraints:
The two sequences always join
   0 < s1 , s2 < 20000000
   0 < joint point < 20000000 Please repeat the request first, then give your response.
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