import sys
from itertools import izip_longest
nfields = 6
fields = (field.strip() for line in sys.stdin for field in line.split(',') if field.strip())
for row in izip_longest(*[iter(fields)]*nfields): # grouper recipe*
print(row)
aW1wb3J0IHN5cwpmcm9tIGl0ZXJ0b29scyBpbXBvcnQgaXppcF9sb25nZXN0CgpuZmllbGRzID0gNgpmaWVsZHMgPSAoZmllbGQuc3RyaXAoKSBmb3IgbGluZSBpbiBzeXMuc3RkaW4gZm9yIGZpZWxkIGluIGxpbmUuc3BsaXQoJywnKSBpZiBmaWVsZC5zdHJpcCgpKQpmb3Igcm93IGluIGl6aXBfbG9uZ2VzdCgqW2l0ZXIoZmllbGRzKV0qbmZpZWxkcyk6ICMgZ3JvdXBlciByZWNpcGUqCiAgICBwcmludChyb3cpCg==
QSwgQiwgQywgRCwgRSwgRgoxMjMsIDQ1NiwgdHJlZQosIHZlcnksIGJsYSwgaW5kaWdv
A, B, C, D, E, F
123, 456, tree
, very, bla, indigo
('A', 'B', 'C', 'D', 'E', 'F')
('123', '456', 'tree', 'very', 'bla', 'indigo')