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: ['7277', 'c', '9587', '2613', '853', 'w', 'y', '4067', 'o', 'u', 'j', 'W', '1517', 'x', 'Y']

SOLUTION: 25914

PROBLEM: ['N', 'V', 't', 'X', 't', 'M']

SOLUTION: 0

PROBLEM: ['f', '8205', 'B', 'O', '873', 't', '7477', '8247', 'A', '7903', '9455', 'v', 's', 'd', '8361', '71']

SOLUTION:
50592