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: ['9125', '1443', '2303', 'O', '8463', '401', '3983', 'g', '4327', 'z', 'n', 'F', 'Q', 'j', '9885']

SOLUTION: 39930

PROBLEM: ['7067', 'E', 'C', '1879', 'Z', 'u', 't', '2053', '6769', 'r', '5207', '7009', 'H', '5587', 'i', 'M', '1357', 'A']

SOLUTION: 36928

PROBLEM: ['D', 'X', '8867', '9115', '2217', 'u', '4583', 'p', '1905', 'V', '107', 'H', '8549']

SOLUTION:
35343