https://www.acmicpc.net/problem/3009

3009.java

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int [][]a = new int[3][2];
        for(int i=0; i<a.length; i++)
            for(int j=0; j<a[0].length; j++)
            a[i][j] = sc.nextInt();
        
        if (a[0][0] == a[1][0]) { // 30 == 10
            System.out.print(a[2][0] + " ");            
        } else if(a[0][0] == a[2][0]) { // 30 ==10
            System.out.print(a[1][0] + " ");
        }else{ //30 x
            System.out.print(a[0][0] + " ");
        }

        if (a[0][1] == a[1][1]) {
            System.out.print(a[2][1]);            
        } else if(a[0][1] == a[2][1]) {
            System.out.print(a[1][1]);
        }else{
            System.out.print(a[0][1]);
        }
        sc.close();
	}
}