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: ['4425', 'x', '1959', 'C', 'c', 'D', 'M', '8317', 'q', 'x', '4277', 'N', 'z', 'I', '1921', 'o', 't']

SOLUTION: 20899

PROBLEM: ['t', 'x', '5629', 'k', '2003', 'v', '541', 'l', 'v', '7983', '677', '6173', 'z', 'J', 's', 'u', '2187', 'Y']

SOLUTION: 25193

PROBLEM: ['e', 'o', 'R', 'N', 'r', 'i']

SOLUTION:
0