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: ['7335', '813', '6461', '8903', '3709', 'V', 'G', 'I', 'P', 'p', 's', 'v', 'R', '4697', '4263', '9897']

SOLUTION: 46078

PROBLEM: ['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']

SOLUTION: 48859

PROBLEM: ['G', 'z', '5613', '6023', '7209', 'b', '2435', 'Z', 'Y', '1325', '7717', 'a', 'H', '4991']

SOLUTION:
35313