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: ['z', 'U', '6817', 's', '3731', 'M', 'I', '1095', 'l', '5993', '5207', 'e', 'L', '5361', 'v', 'g', '1963', '4829', '9541', '8261']

SOLUTION: 52798

PROBLEM: ['M', '9387', '7125', 'c', '1295', 'X', 'l', '9867']

SOLUTION: 27674

PROBLEM: ['3675', '5579', 'W', 'T', 'T', 'l', 'F', 'f', 'H', 'L', 'q', 'f', 'f', '173', '2987', 'Z', '4291']

SOLUTION:
16705