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: ['7067', 'E', 'C', '1879', 'Z', 'u', 't', '2053', '6769', 'r', '5207', '7009', 'H', '5587', 'i', 'M', '1357', 'A']

SOLUTION: 36928

PROBLEM: ['1147', 'f']

SOLUTION: 1147

PROBLEM: ['n', 'A', '8895', '2545', 'O', '2615', 'M', '2917', 'G', '783', '895', 'B', 'J']

SOLUTION:
18650