Ticket Serial Validator

You are given a ticket serial number as a string. The serial number is valid if and only if it meets the following conditions:

1. Its length is between 1 and 100 (inclusive).
2. It contains exactly one upper-case English letter (i.e. one letter from (A) to (Z)).
3. It contains at least one digit (i.e. one character from (0) to (9)).
4. All characters in the serial are alphanumeric (letters and digits only).

If all the conditions are met, print VALID; otherwise, print INVALID.

Note: The input will be given via stdin and the output should be written to stdout.

inputFormat

The input consists of a single line containing a non-empty string representing the ticket serial number. The string may include letters and digits, and its length is at most 100.

outputFormat

Output a single line: VALID if the serial number meets the required conditions; otherwise, output INVALID.## sample

A1b2c3

VALID