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: ['2469', 'c', '6931', 'a', '2167', '9493', '9403', '4123', '4949', 'R', 'V', 'h', '315', 'T', '9411', 'M', '1329', '8217', '6105', 'Y']

SOLUTION: 64912

PROBLEM: ['I', '7815']

SOLUTION: 7815

PROBLEM: ['I', 'r', 'm', '7053', 'T', '9455', 'X']

SOLUTION:
16508