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: ['8109', '6811', 'f', 'l', '5869', 'm', '4657', 'y', 'P', '7983', 'o', 's', 'i', 'm', '2141', '4497']

SOLUTION: 40067

PROBLEM: ['h', '2295', '2913', 'I', '5273', 'L', '2739', '8227', '6537', 'e', '6491', '5463', 'i', '4337', '537']

SOLUTION: 44812

PROBLEM: ['2085', '8859', '509', '9519', 'x', 'A', 'S', 'H', 'U', 'b', 'b', 's', '8531', 'S', 'O', 'g', 'Z', 'O']

SOLUTION:
29503