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: ['9445', '7291', 'r', 'g', '1175', '7823', '5507', 'j', '7249', '6335', '3853', 'b', 'u', 'S', '365', 'Z', '7489', 'S', 'W', 'e']

SOLUTION: 56532

PROBLEM: ['E', 'v', 'l', 'c', 'g', '3929', 'q', 'j']

SOLUTION: 3929

PROBLEM: ['c', 'z', 'T', '7617', 'C', '6497', '6437', 'D', '9291', 'x', '4275']

SOLUTION:
34117