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 C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>

#define STRING_LENGTH 100000
#define ARRAY_SIZE (STRING_LENGTH + 1)

void printOdds(char s[ARRAY_SIZE]);


int main()
{
  char s[ARRAY_SIZE];

  scanf("%s", &s);

  printOdds(s);

  return 0;
}

void printOdds(char s[ARRAY_SIZE])
{
  int i;

  i = 0;
  while (s[i] != '\0')
    {
      printf("%c", s[i]);
      i++;
      if(s[i] == '\0')
	{
	  break;
	}
      i++;
    }
  printf("\n");
}