Serial Number Validator

You are given a serial number as a string and need to validate it based on the following criteria:

• The serial number must be exactly 8 characters long.
• It must contain at least two letters. (Letters can be uppercase or lowercase.)
• It must contain at least two digits.

If the given serial number satisfies all criteria, output Valid, otherwise output Invalid.

Examples:

Input: A1B2C3D4
Output: Valid
Input: AB1C2
Output: Invalid

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inputFormat

The input consists of a single line containing a string representing the serial number.

Note: The input is read from standard input (stdin).

outputFormat

Output a single line which is either Valid or Invalid (without quotes), based on the serial number validation.

Note: The output is written to standard output (stdout).

## sample

A1B2C3D4

Valid