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.

['A', 'y', 'u', 'S']
0

['U', 'd', '893', 'h', '9679', '315', 'H', '339', '2381', '847', '7951', 'e', '9269', '9081', 'o', '6439', 'N', '4531']
51725

['5463', '4157', '5431', '9545', 'O', '9507', '7779', 'U', 'R', '6241']

48123