string = 'a,b,c d!e.f\ncanada\tjapan&germany'
identifiers = '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~\n\t '

listitems = "".join((' ' if c in identifiers else c for c in string)).split()

for item in listitems:
    print(item)