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: ['u', 'i', 'z', 't', '9617', 'd', '3255', 'w', 'S', '3041', '7451']

SOLUTION: 23364

PROBLEM: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']

SOLUTION: 17925

PROBLEM: ['251', 'T', 'k', 'M', '8739', '9073', '1275', '8825', 'Q', '4387', '2583', 'l', 'x', '8341', 'C', '8981', '9857', 'Q']

SOLUTION:
62312