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: ['s', 't', 'W', '163', 'v']

SOLUTION: 163

PROBLEM: ['P', '6161', 'k', '5925', 'h', 'G', 'n']

SOLUTION: 12086

PROBLEM: ['A', 'B', '2007', 'K', '1621', 'R', '6143', 'i', '8235', '6447', 'v', 'q']

SOLUTION:
24453