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#! /usr/bin/python3
import fileinput
from itertools import chain
c=dict()
for line in fileinput.input():
line=line.rstrip("\r\n")
for rep in ('--',"'s",'.','"','(',')',','):
line=line.replace(rep,' ')
for word in line.split():
c.setdefault(word,0)
c[word] += 1
f=dict()
for w in sorted(c.keys()):
f.setdefault(c[w],list())
f[c[w]].append(w)
for n in sorted(f.keys()):
print(' '.join((list(str(n)) + f[n])))
print('')
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