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: ['3565', 'z', '8811', 'z', 'U', '113', 'I', '1307', '135', 'V', 'P', '5183', '2505', '4863', '1113', 'A', '7575', '827', 'B']

SOLUTION: 35997

PROBLEM: ['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']

SOLUTION: 14284

PROBLEM: ['7023', '2301', 'e', 'o', '7349', '8303', '783', '7417', '311', 'w', '8635', '7415', 'G', 'd', '8863', '1319']

SOLUTION:
59719