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.

Ex Input:
['s', '3881', 'l', '5271', '9227', 'Z', '5429', '7691', '6127', '6301', '8533', 'T', '233', 'j', '1685', 'F', 'b', '3797', '6633', '7917']

Ex Output:
72725


Ex Input:
['r', '6537', '3001', '7879']

Ex Output:
17417


Ex Input:
['b', '711', '5817', 'i', '7929', '1431', '927', 'C', '8759', '5221', 'I', 'K', 'q', '9017', 'x', '5453', 'h', '1351', '6245']

Ex Output:

52861