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.

['G', 'e', 'R', '4427', '3401', '3065', 'I', '2781', '6829', '5261']
25764

['z', '447', '9781', 'R', '6083', 'u', '9229', 'Z', 'F', '2437', '9677', 'n', 'G', '6763', '5883', 'B', '9563', '4575']
64438

['E', 'o', 'Z', 'r', 'S', 'T', 'v', '6083', 'U', 'A']

6083