#!/usr/bin/python3
import re
line = input()

extra_spaces = re.compile(r'(?<= ) +')
need_space = re.compile(r'([\.\?\!])(?![ ])')
eol_space = re.compile(r'(?<=[\.\?\!]) +$')
lower = re.compile(r'((?<=[A-Z])[a-zA-Z]*[a-z][a-zA-Z]*|(?<=[a-z])[a-zA-Z]+)')


while(line != ""):
  line = extra_spaces.sub("",line)
  line = need_space.sub(r'\1 ', line)
  line = eol_space.sub("",line)
  line = lower.sub(lambda x: x.group(0).lower(),line)
  print (line)
  line = input()