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>
#include<math.h>
#include<string.h>
int main()
{
 long int x,y,z,sum,i=0,k;
 char a[100000]; 
 gets(a);
 printf("%c",a[0]);
 for(i=1;i<strlen(a);i++)
 {
     if(i%2==0)
     {
      printf("%c",a[i]);   
     }
     
 }
 

    return 0;
}