Problem:
Score : 100 points

Problem Statement

We have a 3×3 square grid, where each square contains a lowercase English letters.
The letter in the square at the i-th row from the top and j-th column from the left is c_{ij}.

Print the string of length 3 that can be obtained by concatenating the letters in the squares on the diagonal connecting the top-left and bottom-right corner of the grid, from the top-left to bottom-right.

Constraints

Input consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

c_{11}c_{12}c_{13}
c_{21}c_{22}c_{23}
c_{31}c_{32}c_{33}

Output

Print the string of length 3 that can be obtained by concatenating the letters on the diagonal connecting the top-left and bottom-right corner of the grid, from the top-left to bottom-right.

Sample Input 1

ant
obe
rec

Sample Output 1

abc

The letters in the squares on the diagonal connecting the top-left and bottom-right corner of the grid are a, b and c from top-right to bottom-left. Concatenate these letters and print abc.

Sample Input 2

edu
cat
ion

Sample Output 2

ean

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

package beginner;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main{
	public static void main(String args[]) throws IOException{
		 String str[] = new String[9];
		 BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		 
		 for(int i=0;i<9;i++) {
			 str[i] = new String(in.readLine());
			 if (i!=8)System.out.println("next!");
		 }
		 
		 for(int i=0;i<9;i++) {
			 System.out.print(str[i]);
			 if (i%3==2) System.out.println();
		 }
		 
		 System.out.println("\n" + str[0] + str[4] + str[8]);
	}
}