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.

Input: Consider Input: ['t', 'G', '217', 'W', 'l', 'j', 'd', 'U', '6795', '1609', 'n', '6919', '617', '5753']

Output: 21910


Input: Consider Input: ['R', 'J', 'z', 'o', '1121', '7247', '8987', 'u']

Output: 17355


Input: Consider Input: ['K', '9281', 'g', '6731', 'n', '4779', 'j']


Output: 20791