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

[EX Q]: ['1875', '9833', 'i', '7493', 'J', 'P', 'z']
[EX A]: 19201

[EX Q]: ['V', '9959', '2825', '4845', '2481', 'h', 'E', 'X', '9361', 'X', 'Q', '5485', '9091', '4023', '2847', '4631']
[EX A]:
55548