#!/usr/bin/env python

import sys

import empty

def add_delim(s):
	s = s[ :: -1 ]
	d = ''
	while len( s ) > 3:
		d += s[ :3 ] + ','
		s = s [ 3: ]
	d += s
	return d[ :: -1 ]

def cnv(s):
	e = empty.new( s='', buf='' )

	def cut_spc(n):
		for i in range( n ):
			if e.s[ -2 : ] == '  ':
				e.s = e.s[ : -1 ]

	def conn():
		if e.buf:
			buf = add_delim( e.buf )
			cut_spc( buf.count( ',' ) )
			e.s += buf
			e.buf = ''

	for c in s:
		if c.isdigit():
			e.buf += c
		else:
			conn()
			e.s += c
	conn()
	return e.s

if __name__ == "__main__":
	s = sys.stdin.read()
	d = cnv( s )
	sys.stdout.write( d )
# EOF