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: ['129', '8667', 'E', '2919', 'e', 'Y', 'h', 'm', '501', '5911', 'q', '4955', 'D', '1369', 'W']

SOLUTION: 24451

PROBLEM: ['4601', '6021', '3005', 'I', 'f', '4631', 'Q', 'd', '8041', 'D', '8067', '7383', '757', 't', 'd', 'n', '2275', 'p', 'm', '6021']

SOLUTION: 50802

PROBLEM: ['1547', '623', '6025', 'n', 'S', 'y', 'p', 'u', 'Z', '1969', 'u', 'S', '3143', '3917', '2507', 'v', '4361', '7775', 'f', '8021']

SOLUTION:
39888