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: ['d', '6851', 'o', '5521', 'l', '3911', 'w', '1005', 'e', '3323', 'r', '7311', '4377']

SOLUTION: 32299

PROBLEM: ['p', '4689']

SOLUTION: 4689

PROBLEM: ['T', '721', '6555', 'g', 'y', 'U', '3053', 'A', '9663']

SOLUTION:
19992