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: ['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']

SOLUTION: 21509

PROBLEM: ['q', '8155', 'L', 'v', '2657', 'X', 'v', '2353', '151', 'R', '967', '4327']

SOLUTION: 18610

PROBLEM: ['W', '4453', '5895', 'Z', 'A', '7663', '2749', 'f', 'H', '6917', '1215', 'M', '1775', '5397', 'l', '8197', '5209', '8229', 'U']

SOLUTION:
57699