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: ['r', 'z', 'u', 'D', '3449', 'E', 'f', 'w', '1627', '4093', '955', 'i', 's', 'R', 'b', '9773', '2169', 'M', '9305', '4775']

SOLUTION: 36146

PROBLEM: ['O', '9829', '5265', 'U', 'z', '2843', '1483', '9293', '1327', '2015']

SOLUTION: 32055

PROBLEM: ['U', 'V', 'a', 'F']

SOLUTION:
0