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: ['I', 'n', '3069', '477', 'F', 'k', '847', '6777', 'N', 'X', 'F', '1417', '9445', 'o', 'v', 'd', '2169', 'w']

SOLUTION: 24201

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

SOLUTION: 36928

PROBLEM: ['2127', '417', 'h', '8461', '9251', 'B', 's', 'z', 'X', '6021', 'm', 'T', '445', '9477', '329', 'd', 'I']

SOLUTION:
36528