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 JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

function main(input) {
  input=input.trim();
  const a = parseInt(input.split("\n")[0].split(" ")[0], 10);
  const b = parseInt(input.split("\n")[1].split(" ")[1], 10);
  const c = parseInt(input.split("\n")[2].split(" ")[2], 10);



  console.log(a+b+c);

}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));