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: ['q', '5151', 'R', '441']

SOLUTION: 5592

PROBLEM: ['D', '9679', 'e', '5537', 'G', 'l', '2653', 'a', 'Y', '8467', 'q', 'L', '7239', 'O']

SOLUTION: 33575

PROBLEM: ['3291', '293', '2225', 'm', '1931', '1881', 'Z', 's', 'r', 'Q', 'z', 'r', 'p', '7879', 'f', '827', 'P', '1331']

SOLUTION:
19658