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: ['3013', '3955', 'f', '1183', '5111', '9509', '2351', '7087', 'f']

SOLUTION: 32209

PROBLEM: ['B', 's']

SOLUTION: 0

PROBLEM: ['i', 'H', 'z', 'b', 'u', 'P', '1729', 'C', 'K']

SOLUTION:
1729