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: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']

SOLUTION: 26299

PROBLEM: ['7187', '5651', 'd', '4869', 'q', '2375', '3547']

SOLUTION: 23629

PROBLEM: ['u', 'Q', '9113', 'k', '1149', '1385', '3573', '9691', 'd', 'G', 'Y', 'x', '3781', '8341', '1187']

SOLUTION:
38220