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: ['E', '9289', 'j', '1847', 'u', 'w', 'z', '4045', '9567', '3133', '2967', 'I', '1927', 'I', 'f', 'T']

SOLUTION: 32775

PROBLEM: ['I', 'J', 'K', 'D', '5961']

SOLUTION: 5961

PROBLEM: ['2991', '8459', 'x', 'j', 'O', '5747', '9381', '6485', 'J', 'z', '9151', '7497', 'j', '3079', '2425', '1017', '9507']

SOLUTION:
65739