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', '8841', 'H', 'v', '2435', '8221', '807', 'P', '2247', 'M', '4609', '5657', 'k', '2807', 'j', '8451']
44075

['7831', 'O', '6017', 'v', 'U', '5761', 'Q', 'Q', 'w', '8465', 'Z', 'P', 'i', 'u', '1635', 'n', '8471', '4213']
42393

['4175', '6869', 'S', 'T', 'd', '109', 'r', '2565', '5327', 'n', '21', 'd', 'q', 'a', '4421', 'S', '9835', 'W', '8875']

42197