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: ['q', '867', 'e', 'z']

SOLUTION: 867

PROBLEM: ['6011', 'G', '9043', '8009', 'e', '9493', 'G', '7969', 'M', 'n', 'p', 'g', '7925', 'H', '3213', '8095', '97', 'F']

SOLUTION: 59855

PROBLEM: ['r', '4815', 'y', '8215']

SOLUTION:
13030