# -*- coding: utf-8
# @Time    : 2021/9/10 13:42
# @Author  : wws
# @File    : 20210910_demo.py
# @Software: PyCharm

string = input().strip()
start, end = 0, 0
if string[0] == ' ':
    start = 1
if string[-1] == ' ':
    end = 1

word_list = string.split(" ")
res = []
# 去除多余的空格
while '' in word_list:
    word_list.remove('')

if start == 1:
    res.append('')
# 合成新的字符
for i in range(len(word_list)):
    if word_list[i][-1] in [',', '.', '...']:
        pass