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: ['3071', '355', 'e', '9781', 'R', '6833', 's', '2665', 'L', '9551', 'P', '6101', '2955', '4643', 'O', '3327', '2163', '685', '4277', 'B']

SOLUTION: 56407

PROBLEM: ['q', 't', '4837', 'F', '2367', '1867', '8361', 'm']

SOLUTION: 17432

PROBLEM: ['F', 'S', '2683', 'b', 's', '6549', 'L', 'w', 'X', '7717', '5155', '971', 'I', '553', '7221', '9033']

SOLUTION:
39882