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', '1611', 'w', '8825', '8987', '3021', '9019', 's', '87', '9283', '5717', 'f', '1503', '6593', '8533', '785', 'g']

SOLUTION: 63964

PROBLEM: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']

SOLUTION: 26755

PROBLEM: ['1311', '7193', '4921', 'G', 'T', '1737', '5335', '6693', 'C', '4117']

SOLUTION:
31307