We consider the sequence of numbers where a number is followed by the same number plus the sum of its digits. For example, 34 is followed by 41 (as 41=34+(3+4)) is itself followed by 46 (46 = 41 + (4+1)) The sequence would be 34 41 46 56 67 .... Two sequences which start from different numbers may join at a given point, for example, the sequence starting from 471 and the sequence starting from 480 shares the number 519 Implement the function which takes the starting points of two sequences and then returns the joining point of these sequences.