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: ['I', '4463', 'p', '6043', 'e', '5859', 't', '3285', 'Z', 'R', 'g', '6613', 'q', '3059', '6907', 'a']
A: 
36229