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: ['r', 'z', 'u', 'D', '3449', 'E', 'f', 'w', '1627', '4093', '955', 'i', 's', 'R', 'b', '9773', '2169', 'M', '9305', '4775']

SOLUTION: 36146

PROBLEM: ['q', 'Y', '6021', '4045']

SOLUTION: 10066

PROBLEM: ['i', '1337', 'V', 'W', '7515', '2625', 'a', 'v', 'O', 'a', 't', 'i', 'g', 'H', '2155', '4869', 'e', 'd', '1039']

SOLUTION:
19540