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: ['1493', 'x', 'h', '31', '3327', '1621', '4529', 'd', '377', 'R', 'X', 'Z', 'G']

SOLUTION: 11378

PROBLEM: ['6577', 'Q', '6865', '7671', 'N']

SOLUTION: 21113

PROBLEM: ['H', '4851', 'b', 'b', '4785', '6637', 'o', 'o', '4117', 'p', '6393', 'f', 's', 'c', 'k']

SOLUTION:
26783