Bracket the Dots

Easy

To keep an IP address in an email from turning into a clickable link, people "defuse" it by replacing every dot . with [.]. Given a valid IPv4 address ip, return its defused form.

Example 1

ip='10.0.0.1' → '10[.]0[.]0[.]1'

Each of the three dots becomes [.].

Example 2

ip='172.16.254.3' → '172[.]16[.]254[.]3'

The digits stay as they are; only the dots change.

Constraints

ip is a valid IPv4 address: four numbers from 0 to 255 separated by dots, with no leading zeros

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Input

ip='10.0.0.1'

Expected

'10[.]0[.]0[.]1'

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