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# AP Lab: Computer Science Principles
>This activity will ask you to reverse a basic program and solve an introductory reversing challenge. You will be given an output that is to be used in order to reconstruct the input, which is the flag.
>
>Note: The "Student Guide" isn't needed to solve the challenges in this series.
>
>Author: AC
We are reversing a Java program. The program is asking for a password. I'm assuming the password is the flag.
```java
inp=shift2(shift(inp));
if (inp.equals("inagzgkpm)Wl&Tg&io")) {
System.out.println("Correct. Your input is the flag.");
}
else {
System.out.println("Your input is incorrect.");
}
```
The input is put into two functions, `shift` and `shift2`. The output must be that obfuscated string or else the password is incorrect.
Because we are working our way backwards, let's start with `shift2()`
```java
public static String shift2(String input) {
String ret = "";
for (int i = 0; i
