func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long i, j, n, m, k, a, b;     long long x[3], y[3];     for (i = 0; i < 3; i++) cin >> x[i] >> y[i];     cout << 3 << endl;     for (i = 0; i < 3; i++)       cout << (x[i] + x[(i + 1) % 3]) - x[(i + 2) % 3] <<                << (y[i] + y[(i + 1) % 3]) - y[(i + 2) % 3] << endl;     return 0;   }   