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 Rust (1.42.0) (judge verdict: Accepted)

use itertools::Itertools;

fn main() {
    proconio::input! {
    a:String,
    }
    let a=a.chars().collect_vec();
    let mut b =Vec::new();
    for i in 0..a.len() {
        if i%2==0 {
            b.push(a[i])
        }
    }
    let b:String=b.into_iter().collect();
    println!("{}",b)
}