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-----
atcoder

-----Sample Output-----
acdr

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

Source: atcoder | Difficulty: EASY


Solutions:
s = input()
i = 0
answer = str()
for j in s:
	if i % 2 == 0:
		answer += j
	i += 1
print(answer)


S = input()
print(S[0:len(S):2])


s = input()
for i in range(0, len(s), 2):
	print(s[i], end='')
print()


s = input()
print(s[0::2])


s = input()
print(s[::2])


a = list(input())
a_135 = a[0::2]
mojiretu = ''.join(a_135)
print(mojiretu)


s = str(input())
for i in range(len(s)):
	if i % 2 == 0:
		print(s[i], end='')


class Odd:

	def __init__(self, s: str):
		self.s = s

	def odd_str(self):
		m = []
		l = int(len(self.s))
		for i in range(0, l, 2):
			m.append(self.s[i])
		print(''.join(m))
odd1 = Odd(input())
odd1.odd_str()


S = list(input())
new_list = ''
for i in range(len(S)):
	if i % 2 == 0:
		new_list += S[i]
print(new_list)


s = input()
N = len(s)
result = []
for i in range(0, N):
	if i == 0 or i % 2 == 0:
		result.append(s[i])
s = ''
N = len(result)
for i in range(0, N):
	s += result[i]
print(s)


S = str(input())
print(S[0::2])


print(input()[::2])


s = str(input())
print(s[::2])


S = str(input())
print(S[::2])


s = input()
a = ''
for i in range(0, len(s), 2):
	a = a + s[i]
print(a)


s = input()
ans = [i for (index, i) in enumerate(s, start=1) if index % 2 != 0]
print(''.join(ans))


N = list(input())
ans = []
for i in range(len(N)):
	if i % 2 == 0:
		ans.append(N[i])
print(''.join(ans))


s = input()
b = ''
for a in range(len(s)):
	if a % 2 == 0:
		b = b + s[a]
print(b)


s = input()
letters = ''
for (i, letter) in enumerate(s):
	if i % 2 == 0:
		letters += letter
print(letters)


s = input()
res = ''
for i in range(len(s)):
	if i % 2 == 0:
		res += s[i]
print(res)


s = input()
li = []
for i in range(len(s)):
	if i % 2 == 0:
		li.append(s[i])
print(''.join(li))


import math
a = input()
x = ''
for i in range(math.ceil(len(a) / 2)):
	x += a[i * 2]
print(x)


s = input()
odd_num = list()
for i in range(len(s)):
	if i % 2 == 0:
		odd_num.append(s[i])
answer = ''.join(odd_num)
print(answer)


s = list(input())
print(''.join(s[0::2]))


S = input()
S1 = '0' + S
print(S1[1::2])


s = input()
even = []

def listtostring(some):
	str1 = ''
	for ele in some:
		str1 += ele
	print(str1)
for i in range(len(s)):
	moji = s[i]
	if i % 2 == 0:
		even.append(moji)
listtostring(even)


S = list(input())
S.insert(0, '0')
for i in range(1, len(S), 2):
	print(S[i], end='')
print()


words = str(input())
print(words[0::2])


str = input()
print(str[::2])


result = ''
for (i, c) in enumerate(list(input())):
	if i % 2 == 0:
		result += c
print(result)


s = input()
x = ''
for i in range(0, len(s)):
	if i % 2 == 0:
		x = x + s[i]
print(x)


s = input()
n = (len(s) + 1) // 2
ans = ''
for i in range(n):
	ans += s[2 * i]
print(ans)


s = input()
j = 0
m = ''
for i in s:
	j += 1
	if j % 2 == 1:
		m += i
print(m)


s = input()
ans = ''
for i in range(len(s)):
	if i % 2 == 0:
		ans += s[i]
print(ans)


s = list(input())
l = int(len(s))
m = []
for i in range(0, l, 2):
	m.append(s[i])
print(''.join(m))


s = input()
print(''.join([c for (index, c) in enumerate(s) if index % 2 == 0]))


s = str(input())
i = 1
result = ''
for i in range(len(s) + 1):
	if i % 2 == 0:
		pass
	else:
		result += s[i - 1]
print(result)


s = input()
if len(s) % 2 == 0:
	f = len(s) // 2
else:
	f = len(s) // 2 + 1
for i in range(f):
	print(s[2 * i], end='')


a = input().split()[0]
b = ''
for i in range(len(a)):
	if i % 2 == 0:
		b += a[i]
print(b)


S = input()
ans = ''
for (i, s) in enumerate(S):
	if i % 2 == 0:
		ans += s
print(ans)


s = str(input())

def answer(s: str) -> str:
	ans = ''
	for i in range(len(s)):
		if i % 2 == 0:
			ans += s[i]
	return ans
print(answer(s))


s = input()
s.split()
odd = []
for i in range(len(s)):
	if i % 2 == 0:
		odd.append(s[i])
answer = ''.join(odd)
print(answer)


s = str(input())
k = 0
odd = ''
for k in range(len(s)):
	if k % 2 == 0:
		odd += s[k]
print(odd)


s = input()
n: int = 0
odds = ''
for i in s:
	if n % 2 == 0:
		odd = s[n]
		odds += odd
	elif n == 0:
		odd = s[n]
		odds += odd
	else:
		pass
	n += 1
print(odds)


from math import gcd
from itertools import combinations, permutations, accumulate, product
from collections import deque, defaultdict, Counter
import decimal
import re
import math
import bisect
import heapq
import sys
sys.setrecursionlimit(10000000)
mod = 10 ** 9 + 7
INF = float('inf')
from sys import stdin
readline = stdin.readline

def readInts():
	return list(map(int, readline().split()))

def readTuples():
	return tuple(map(int, readline().split()))

def I():
	return int(readline())
s = input()
print(s[::2])


S = input()
count = 1
str_odd = ''
for i in S:
	if count % 2 == 1:
		str_odd += i
	count += 1
print(str_odd)


s = input()
print(s[0:len(s) + 1:2])


a = input()
for i in range(0, len(a), 2):
	print(a[i], end='')