In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.

['o', 'O', 'H', '7619', '6435', 'X', 'g', '1663']
15717

['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']
50770

['4711', 'y', '637', 'R', '8755', '6551', '5203', '4279', 's', '8343', 'x', '6137', '9291', '619', '3765']

58291