/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* 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
 
		int a = 6;
		int error = 0;
 
		switch (a){
			case 4:
			case 5:
			case 37:
			case 6: break;
			default: error = 4;		// invalid prefix
		}
 
		System.out.print(error);
		if (error == 0)
		System.out.print("good");
 
	}
 
}

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