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: ['M', '9933', '9861', 'f', 'N', 'R', '7625', 'p', 'T']

SOLUTION: 27419

PROBLEM: ['135', 'a', 'X', '8067', '8447', '4009', '4221', 'o', 'A', 'x']

SOLUTION: 24879

PROBLEM: ['Z', '8227', 'B', '8113', '1077', 'O', '1433', '9813', '2705', 'Z', '1275', 'r', 'w']

SOLUTION:
32643