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.

['u', 'W', '1561', '9243', '4923', '9385']
25112

['W', '8593', '9427', '9931', '8919', 'X', 'B', '8861', '1933', 'Z', 'V', '3427', 'S', '8717', 'd', '1593', '7659', 'Q', 'n']
69060

['z', '3199', 'r', '849', 'C', 'v', '1931', 'M', 'Q', '4531', '579', 'x', '8997', '4663']

24749