#include <iostream>
using namespace std;
struct point { int x; int y; } a, b;
int main() {
a.x = 1; a.y = -1;
b.x = 2; b.y = 3;
point tmp = a; a = b; b = tmp;
cout << a.x << " " << a.y << endl;
cout << b.x << " " << b.y << endl;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKc3RydWN0IHBvaW50IHsgaW50IHg7IGludCB5OyB9IGEsIGI7CgppbnQgbWFpbigpIHsKCWEueCA9IDE7IGEueSA9IC0xOwoJYi54ID0gMjsgYi55ID0gMzsKCXBvaW50IHRtcCA9IGE7IGEgPSBiOyBiID0gdG1wOwoJY291dCA8PCBhLnggPDwgIiAiIDw8IGEueSA8PCBlbmRsOwoJY291dCA8PCBiLnggPDwgIiAiIDw8IGIueSA8PCBlbmRsOwp9