#include <bits/stdc++.h>
using namespace std;

#include <atcoder/all>
using namespace atcoder;

using ll = long long;
using mint = modint998244353;

int main() {
  int A, B;
  cin >> A >> B;
  int ans = 0;
  for(int X = 0; X <= 255; X++) {
    ans += (A ^ X) == B;
    if(ans) cout << X << endl;
  }
  // cout << ans << endl;
}