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: ['95', '279', 'y', 'p', '5083', 'X', 'E', '3817']

SOLUTION: 9274

PROBLEM: ['D', 'G', '9895', '143', '37', 'S', '1539', 'x', 'a', 'x', 'B', 'i', '9719', '839']

SOLUTION: 22172

PROBLEM: ['2833', 'U', 'l', '2729', '49', '9887', 'I', 'n', '7683', 'A']

SOLUTION:
23181