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 Q]: ['m', 'g', '7251', '5873', '59', '7345']
[EX A]: 20528

[EX Q]: ['C', 'v', '1353', 'e', 'x', 'A', 'D', '1243', '477', 'z', '3483', '5213', 'k', 'm', 'n']
[EX A]: 11769

[EX Q]: ['w', '2209', 'd', 'h', '3055', 'f', 'r', '103', '5209', 't', '9311', 'U', '8067', '3319', '285', 'B', '3055', 'H', '2183']
[EX A]:
36796