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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
 
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
 
	protected String decryptFlag(byte[] key, String encrypted) {
        SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
        cipher.init(2, keySpec);
        return new String(cipher.doFinal(Base64.getDecoder().decode(encrypted)));
    }
}

Main.java:21: error: unreported exception NoSuchAlgorithmException; must be caught or declared to be thrown
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
                                          ^
Main.java:22: error: unreported exception InvalidKeyException; must be caught or declared to be thrown
        cipher.init(2, keySpec);
                   ^
Main.java:23: error: unreported exception IllegalBlockSizeException; must be caught or declared to be thrown
        return new String(cipher.doFinal(Base64.getDecoder().decode(encrypted)));
                                        ^
3 errors

Standard output is empty