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.

['Q', '9787', '7533', '9489', 'C', '1753', '5121', '1405', '9267', '4815', 's', '5887']
55057

['m', '4645', '711', 'l', '5085', '8989', '2387', 'n', 'V', '1613', '4011', '3261', 'p', 'X', '349', 'e']
31051

['y', 'd', '3109', '87', '6231']

9427