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: ['3121', 'j']

SOLUTION: 3121

PROBLEM: ['2895', '8095', 'y', '1927', '4827']

SOLUTION: 17744

PROBLEM: ['G', '7689', '3447', '7285', '5321']

SOLUTION:
23742