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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;

public class Main {
	
    
	public static void main(String args[]) {
    	Scanner sc = new Scanner(System.in);
    	
    	String sss = sc.next();
    	sc.close();
    	String temp = null;
    	StringBuilder ss = new StringBuilder();
    	for(int i = 0; i < sss.length(); i+=2) {
    		 
    		ss.append(sss.charAt(i));
    		
    	}
    	
    	temp = ss.toString();
    	System.out.println(temp);
      
    }
}