func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long int u, v, w;     cin >> u >> v;     if (u > v || (u + v) % 2 != 0)       cout << -1 << endl;     else if (u == v && u == 0)       cout << 0 << endl;     else if (u == v)       cout << 1 << endl << u << endl;     else {       w = (v - u) / 2;       if ((u & w) == 0)         cout << 2 << endl << u + w <<     << w << endl;       else         cout << 3 << endl << u <<     << w <<     << w << endl;     }     return 0;   }   