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', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']
[EX A]: 40372

[EX Q]: ['3873', 'D', 'J', '2799', 'k', 'F', 'I', '3457', '5647', '4815', '7509', 'Y', '1251', '2211']
[EX A]: 31562

[EX Q]: ['1775', '5783', '521', '9433', '5649', 'P', 'd', 'f', '5669', '6339', 'u', 'P', '4603', 'h', 'r']
[EX A]:
39772