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.

['1073', 'i', 'o', 'j', 'O', 'g', 'X', '3261', '5105', '4831', 'J']
14270

['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']
14966

['g', '77', 'A', '6827']
6904