Exception Propagation: Delegating Exceptions with throws

In this problem, you will create a program that simulates file reading using a FileReader class, propagates exceptions to the caller via the throws clause based on the input filename, and displays the result to standard output.

Learning Objective: Understand how to propagate exceptions to the caller using throws clause

Simulate file reading in FileReader class and propagate exceptions to caller.

Input

Line 1: Filename ("valid.txt", "missing.txt", or "error.txt")

Output

Valid.txt: Content: Hello World
Missing.txt: File not found: missing.txt
Error.txt: IO error occurred

Example

Input:

valid.txt
```java
Output:
```java
Content: Hello World