What is the output of the following program?

void f(int& x, int& y) {
  if (x > y) {
    int t = x;
    x = y;
    y = t;
  }
}
 
void f(int& x, int y, int& z) {
  f(x, y);
  f(y, z);
  f(x, y);
}
 
int main() {
  int x = 3, y = 1, z = 2;
  f(x, y, z);
  cout << x << " - " << y << " - " << z << endl;
  return 0;
}