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: ['1203', '6179', '9835']

SOLUTION: 17217

PROBLEM: ['v', '4119', 'I', '475', 'd', 'L', '909', 'F', 'V', '775', 'k', 'A', '9411', '8383', 'W', '1521', 'z', 'j', '7057', 'I']

SOLUTION: 32650

PROBLEM: ['8227', 'r', 'U', 'n', '7365', '7515', 'a', 'Q', '9921', 'w', 'x', '9451']

SOLUTION:
42479