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: ['M', 'H', 'l', 'Y', '3811', '1953', '5869', 'U']

SOLUTION: 11633

PROBLEM: ['5215', 'c', '839', 'V']

SOLUTION: 6054

PROBLEM: ['w', '157', '2733', 'd', '4457', 'E', 'N', 'Q']

SOLUTION:
7347