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: ['E', '9289', 'j', '1847', 'u', 'w', 'z', '4045', '9567', '3133', '2967', 'I', '1927', 'I', 'f', 'T']

SOLUTION: 32775

PROBLEM: ['J', 'S', 'S', 'U', 'w', '7691', '7529', 'B', '3861', '4557', 'd', '569', '1547']

SOLUTION: 25754

PROBLEM: ['U', '6531', '4059', '8075', '9427', 'l']

SOLUTION:
28092