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: ['P', '237', 'X', '8893', '7931', 'F', '8359', 'S', '6931', '6953', 'r']

SOLUTION: 39304

PROBLEM: ['x', '1305', 'b', '8193']

SOLUTION: 9498

PROBLEM: ['m', '2831', 'A', 'v', '3201', 'm', '2433', '4237', '5551', '8077', 'R', 'W', '195', '8651', '7625', 'j']

SOLUTION:
42801