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.

['6907', '9123', 'L', '8871', 'q', 'C', 'U', '7403', 'F', '3827', '3951', '8879', '2865', 'x', '6175', 'T', '1147']
59148

['w', '7301', '9411', 'z', 'g', 'X', '1045', 'l', 'F', 'M', 'R', '7957', 'e', '5145']
30859

['6947', 'I', 'k', 'j', 'L', 'v', 't', '4283', '7003', '2407', 'R', 'e', '4467', 'W', 'j', 'e']

25107