340. Validate an IPv4 Address
MediumParsingValidation
Print VALID if the string is a valid IPv4 address (four decimal numbers 0–255 separated by dots, no leading zeros except the number 0 itself), else INVALID.
Input format
A single line.
Output format
VALID or INVALID
Example 1
Input
192.168.1.1
Output
VALID
Example 2
Input
256.1.1.1
Output
INVALID
Constraints
1 ≤ length ≤ 50
Read input from standard input and print the answer to standard output. Your code is judged against 7 test cases, most of them hidden.
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