TASK DEFINITION: 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.
PROBLEM: ['5829', '9755', '67', 'F', '6347', 'p', 'i', 'X', 'z', 'o', '2321', 'F', '6145', 'B', '3903']

SOLUTION: 34367

PROBLEM: ['L', 'w', '2783', '6993', 'd', '9173']

SOLUTION: 18949

PROBLEM: ['t', '5589', '9159', 'S', 'j', '1201', 'n', 'd', 'r', '2345', 'K', 'M', '7943', 'B', '519', '9507', 'r']

SOLUTION:
36263