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.

Q: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']

A: 26299
****
Q: ['6849', 'I', 'p', 's', 'L', '4757', 'j', 'x', 'm', 'P', '5237', '1105', '9015', '9279', 'Q']

A: 36242
****
Q: ['1805', 'F', '8873', '4025', '6523', 's', 'u', 'F', 't', 's', '1089', '4675']

A:
26990
****