import re
s = input()


pattern = r'(?<!")([.?!])(?!")'
split_text = re.split(pattern, s)
#merge back the sentence + last character
merged_list = [split_text[i] + split_text[i + 1] for i in range(0, len(split_text) - 1, 2)]

#check for words <= 2 and anding on a fullstop. These are like Dr. Mr. Ms. etc and merge these back
new_text = []
do_continue = False
for i in range(len(merged_list) - 1):
    #print(i, "new_text: " , merged_list[i])
    if do_continue:
        do_continue = False
        continue
        
    if len(merged_list[i].strip()) <= 3 and merged_list[i][-1] == ".":
        new_text[-1] = new_text[-1] + " " + merged_list[i].strip()
        new_text[-1] = new_text[-1] + " " + merged_list[i+1].strip()
				#skip the next entry in the list
        do_continue = True
    else:
        new_text.append(merged_list[i])
        
for i in new_text:   
     print(i)