IPv6

IPv6 is a next-generation Internet protocol whose addresses are 128 bits long.

An IPv6 address is written as 32 hexadecimal digits split into groups of 4 digits. Adjacent groups are separated by colons (:).

For example:

2001:0db8:85a3:0000:0000:8a2e:0370:7334

Because 32 hexadecimal digits are inconvenient for people to read and write, and many digits are usually zero, an IPv6 address may be shortened as follows.

1. Some or all leading zeroes in each group may be omitted. The address above can be shortened to:

2001:db8:85a3:0:00:8a2e:370:7334

2. If one or more consecutive groups consist only of zeroes, exactly one such consecutive run may be replaced by two colons (::).

2001:db8:85a3::8a2e:370:7334

The second rule may be used only once, to avoid ambiguity.

Given a valid shortened IPv6 address, restore and print its original unshortened form as eight groups of four hexadecimal digits.

The first line contains a valid IPv6 address. Its length is at most 39 characters, and it consists only of digits 0-9, lowercase letters a-f, and colons (:).

Print the unshortened form of the given IPv6 address.