code
public void solve(int testNumber, FastReader scan, PrintWriter out) {
int a = scan.nextInt();
int b = scan.nextInt();
int sum = Integer.MIN_VALUE;
int q1 = a^a;
int q2 = b^b;
int q3 = a^b;
if(q1 >= sum){
sum = q1;
}
if(q2 >= sum){
sum = q2;
}
if(q3 >=sum){
sum = q3;
}
// int[] arr = new int[n];
out.println(sum);
}