1582: CF81 - B. Sequence Formatting
[Creator : ]
Description
Polycarp is very careful. He even types numeric sequences carefully, unlike his classmates. If he sees a sequence without a space after the comma, with two spaces in a row, or when something else does not look neat, he rushes to correct it. For example, number sequence written like "1,2,3,...,10" will be corrected to "1,2,3,...,10".
In this task you are given a strings, which is composed by a concatination of terms, each of which may be:
- a positive integer of an arbitrary length (leading zeroes are not allowed),
- a "comma" symbol (","),
- a "space" symbol (""),
- "three dots" ("...", that is, exactly three points written one after another, also known as suspension points).
- each comma is followed by exactly one space (if the comma is the last character in the string, this rule does not apply to it),
- each "three dots" term is preceded by exactly one space (if the dots are at the beginning of the string, this rule does not apply to the term),
- if two consecutive numbers were separated by spaces only (one or more), then exactly one of them should be left,
- there should not be other spaces.
Input
The input data contains a single string $s$. Its length is from 1 to 255 characters. The stringsdoes not begin and end with a space. Its content matches the description given above.
Output
Print the string $s$ after it is processed. Your program's output should beexactlythe same as the expected answer. It is permissible to end output line with a line-break character, and without it.
Sample 1 Input
1,2 ,3,..., 10
Sample 1 Output
1, 2, 3, ..., 10
Sample 2 Input
1,,,4...5......6
Sample 2 Output
1, , , 4 ...5 ... ...6
Sample 3 Input
...,1,2,3,...
Sample 3 Output
..., 1, 2, 3, ...
HINT
CF81.