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: ['8665', '6083', '9819', 'H', 'p', 'S', 'R', '4311', 'R', '7193']

SOLUTION: 36071

PROBLEM: ['t', 'G', '217', 'W', 'l', 'j', 'd', 'U', '6795', '1609', 'n', '6919', '617', '5753']

SOLUTION: 21910

PROBLEM: ['4621', 'n', '3409', '9435', 'I', 'F', 'o', '4431', 'W', 'y', '9979', 'S', '6235', 'y', 'F', 'm', '5473', 'X', '8647']

SOLUTION:
52230