Detailed Instructions: 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: ['n', '6681', '4069', '5011', '4015', '5783', 'm', 'z', 't', 'W', '7299', 'r', '4561', '1797', 'N', '2025']
A:
41241