/* package whatever; // don't place package name! */
 
import java.util.*;
import java.util.stream.*;
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
	{
		System.out.println(uniqueBits(4, 5, 6));
		System.out.println(uniqueBits(12, 4, 9));
	}
 
	static int uniqueBits(int... array) {
		return IntStream.range(0, 32)
                .map(i -> 1 << i)
                .filter(i -> Arrays.stream(array).filter(n -> (n & i) != 0).count() == 1)
                .reduce(0, (a, b) -> a | b);
	}
}

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