Problem:
Score : 200 points

Problem Statement

You are given a string s consisting of lowercase English letters. Extract all the characters in the odd-indexed positions and print the string obtained by concatenating them. Here, the leftmost character is assigned the index 1.

Constraints

Each character in s is a lowercase English letter.

1≤|s|≤10^5

Input

The input is given from Standard Input in the following format:

s

Output

Print the string obtained by concatenating all the characters in the odd-numbered positions.

Sample Input 1

atcoder

Sample Output 1

acdr

Extract the first character a, the third character c, the fifth character d and the seventh character r to obtain acdr.

Sample Input 2

aaaa

Sample Output 2

aa

Sample Input 3

z

Sample Output 3

z

Sample Input 4

fukuokayamaguchi

Sample Output 4

fkoaaauh

Solution in JavaScript (node.js v5.12) (judge verdict: Accepted)

function Main(input) {
  var s = input.split("\n")[0];
  var oddstr = "";
  for(var i = 0; i < s.length; i++) if((i + 1) % 2 === 1) oddstr += s[i];
  console.log(oddstr);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));