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: ['6907', '9123', 'L', '8871', 'q', 'C', 'U', '7403', 'F', '3827', '3951', '8879', '2865', 'x', '6175', 'T', '1147']

SOLUTION: 59148

PROBLEM: ['v', '9511', 'f', 'q']

SOLUTION: 9511

PROBLEM: ['R', 'w', 'A']

SOLUTION:
0