// ConsoleApplication52.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <iomanip>
using namespace std;

/*
int main()
{
	int incarr[] = { 1,3,7,10,12,14,15,16,17,21};
	int decarr[] = {51,31,22,19,18,13,11,6,3,2};
	int i = 0;
	int incsize=sizeof(incarr) / sizeof(incarr[0]);
	int j =  sizeof(decarr) / sizeof(decarr[0])-1;
	while (0==0) {
		if (incarr[i] < decarr[j]) { cout << incarr[i] << " "; i++; }
		else if (incarr[i] == decarr[j]) { cout << incarr[i] << " "; i++; j--; }
		else if (incarr[i] > decarr[j]) { cout << decarr[j] << " "; j--; }
		if (j == -1 || i == incsize) { break; }
	}
	if (j == -1)while (i < incsize) { cout << incarr[i]<<" "; i++; }
	else while (j>=0) { cout << decarr[i]<<" "; j--; }

    return 0;
}




int main() {
	int arr[4][4];

	for (int i = 0; i < 4; i++)
	{
		for (int j = 0; j < 4; j++)
		{
			cin >> arr[i][j];
		}
	}
	for (int i = 2; i >= 0;i--) {
		cout <<endl;
		for (int j =i; j>=0;j-- ) {
			cout << arr[j][i-j];
		}
	}
	for (int i = 6; i >=4; i--) {
		cout  << endl;
		for (int j = 3; j>i-j ;j--) {
			cout << arr[i-j][j];
		}
	}

	return 0;
}*/