codeforce - pashmak and garden

#include <iostream>
using namespace std;
int abs(int x)
{
    return (x > 0 ? x : -x);
}
int main()
{
    ios::sync_with_stdio(false);
    int x1, y1, x2, y2;
    cin >> x1 >> y1 >> x2 >> y2;
    if (x1 != x2 && y1 != y2 && abs(x1 - x2) != abs(y1 - y2))
        cout << -1 << endl;
    else if (x1 == x2)
        cout << x1 + abs(y1 - y2) << " " << y1 << " " << x2 + abs(y1 - y2) << " " << y2 << endl;
    else if (y1 == y2)
        cout << x1 << " " << y1 + abs(x1 - x2) << " " << x2 << " " << y2 + abs(x1 - x2) << endl;
    else
        cout << x1 << " " << y2 << " " << x2 << " " << y1 << endl;
    return 0;
}