import java.util.Scanner;

public class Test41 {

    public static void main(String[] args) {
        System.out.println("请输入10个整数：");
        Scanner scanner = new Scanner(System.in);
        int[] arr = new int[10];
        for(int i=0; i<10; i++){
            arr[i] = scanner.nextInt();
        }
        
        for(int i=0; i<5; i++){
            System.out.println(arr[i] + ", " + arr[9-i]);
        }
    }
}