Valid Python Variable Name

You are given a candidate string and your task is to determine whether it is a valid Python variable name. A variable name in Python must satisfy the following conditions:

• The name must not be empty.
• The first character must be a letter (a-z, A-Z) or an underscore (_).
• All subsequent characters must be letters, digits (0-9), or underscores (_).
• The name must not be a reserved Python keyword (e.g., \(\text{for}\), \(\text{while}\), \(\text{if}\), etc.).

You will read the candidate name from standard input and print Valid if it meets all the criteria or Invalid otherwise.

inputFormat

The input consists of a single line containing the candidate variable name. Note that the input may contain leading or trailing whitespace which should be ignored.

outputFormat

Output a single line: Valid if the candidate is a valid Python variable name, otherwise output Invalid.

variable

Valid