You are updating the username policy on your company's internal networking platform. According to the policy, a username is considered valid if all the following constraints are satisfied:
- The username consists of to characters inclusive. If the username consists of less than or greater than characters, then it is an invalid username.
- The username can only contain alphanumeric characters and underscores (
_). Alphanumeric characters describe the character set consisting of lowercase characters , uppercase characters , and digits . - The first character of the username must be an alphabetic character, i.e., either lowercase character or uppercase character .
For example:
| Username | Validity |
|---|---|
| INVALID; Username length < 8 characters | |
| VALID | |
| VALID | |
| INVALID; Username begins with non-alphabetic character | |
| INVALID; '?' character not allowed |
Update the value of regularExpression field in the UsernameValidator class so that the regular expression only matches with valid usernames.
Input Format
The first line of input contains an integer , describing the total number of usernames. Each of the next lines contains a string describing the username. The locked stub code reads the inputs and validates the username.
Constraints
- The username consists of any printable characters.
Output Format
For each of the usernames, the locked stub code prints Valid if the username is valid; otherwise Invalid each on a new line.
Sample Input 0
8
Julia
Samantha
Samantha_21
1Samantha
Samantha?10_2A
JuliaZ007
Julia@007
_Julia007
Sample Output 0
Invalid
Valid
Valid
Invalid
Invalid
Valid
Invalid
Invalid
Explanation 0
Refer diagram in the challenge statement.