ZOJ-2099

import java.util.Scanner;public class Main{public static void main(String[] args){Scanner sc = new Scanner(System.in);while (true){int x = sc.nextInt();int y = sc.nextInt();if (x == 0 && y == 0)break;int xmin = x, xmax = x;int ymin = y, ymax = y;while (x != 0 || y != 0){if (x < xmin)xmin = x;if (x > xmax)xmax = x;if (y < ymin)ymin = y;if (y > ymax)ymax = y;x = sc.nextInt();y = sc.nextInt();}System.out.format("%d %d %d %d\n", xmin, ymin, xmax, ymax);}}}