While Loop: Password Retry

Learning Objective: Implement processing that repeats until condition changes using while loop

Repeat password input until correct value entered. Implement authentication loop using while loop.

Input

Line 1 onwards: Password attempts (string, multiple lines possible)

Output

When incorrect:

Incorrect. Please try again.
```java
When correct:
```java
Authentication successful!
```java

Correct password: "secret"

## Examples

### Example 1: Success After One Failure
Input:
```java
wrong
secret
```java
Output:
```java
Incorrect. Please try again.
Authentication successful!
```java

### Example 2: Success on First Try
Input:
```java
secret
```java
Output:
```java
Authentication successful!
```java

### Example 3: Success After Multiple Failures
Input:
```java
abc
123
secret
```java
Output:
```java
Incorrect. Please try again.
Incorrect. Please try again.
Authentication successful!