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.

['J', 'm', '1255', 'S']
1255

['M', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']
40372

['E', 'I', '8519', '4795', '8475', 'n', 'U', '4627', 't', '179', '3219', '685', '5409', 'C', '4073', '9313', '9113', 'T', 'A']

58407