func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long int;   using ui = unsigned int;   using pii = pair<int, int>;   using pll = pair<int, int>;   struct fast_ios {     fast_ios() {       ios::sync_with_stdio(false);       cin.tie(NULL);     }   } fast_ios_;   ll u, v, a;   int solve() {     cin >> u >> v;     if (u > v || (v - u) & 1) return puts( -1 ), 0;     if (u + v == 0) return puts( 0 ), 0;     if (u == v) return printf( 1 n%lld n , u), 0;     a = (v - u) / 2;     if (u & a) return printf( 3 n%lld %lld %lld n , u, a, a), 0;     return printf( 2 n%lld %lld n , u + a, a), 0;   }   int main() {     solve();     return 0;   }   