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.

['4701', 'b', 'i', 'B', 'z', '7837', 'W']
12538

['A', '9979', '8723', '1131', 'i', 'p', 'M']
19833

['4635', 'J', '271', '8453', '5527', 'F', '9595', '5061', '9253', 'D', '9277', '2317', '3437', '8703', 'f']

66529