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 (Python):
S = list(input())

result = ""
for i, s in enumerate(S):
    if i % 2 == 0:
	    result += s
        
print(result)

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
a = input()
b = ""
for i in range(0, len(a), 2):
    b += a[i]
print(b)

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

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

Solution (Python):
s = [i for i in input()]
answer = []

for i in range(len(s)):
    if(i % 2 == 0):
        answer.append(s[i])

print("".join(answer))

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

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

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

Solution (Python):

s = input()

print(s[::2])

Solution (Python):

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

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

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

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

Solution (Python):
print(input()[::2])

Solution (Python):
print(''.join([c for i, c in enumerate(input()) if i % 2 == 0]))

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

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

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()

odds = []

for i in range(0, len(s), 2):
    odds.append(s[i])

print(''.join(odds))

Solution (Python):
s = input()
ans = ""

for i in range(len(s)):

    if i % 2 == 0:

        ans += s[i]

print (ans)

Solution (Python):
S = input()
print(S[::2])

Solution (Python):
s_list = [s for s in input()]
s_out = ''
for i in range(len(s_list)):
  if (i + 1) % 2 != 0:
    s_out += s_list[i]
    
print(s_out)

Solution (Python):
a = input()
print(a[0:len(a):2])

Solution (Python):
s = str(input())

print(s[::2])

Solution (Python):
s=input()
ans = str()
for i in range(0,len(s),2):
    ans+=s[i]
print(ans)

Solution (Python):
text = input()
l = len(text)
ans = ''

for i in range(l):
    if i%2==0:
        ans += text[i]
print(ans)

Solution (Python):
row = input().split()
s = list(row[0])
temp = []

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

Solution (Python):



s = list(input())

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

Solution (Python):
ip = input()
count = 0
op = ""
for i in range(len(ip)):
    count+=1
    if count % 2 == 1:
        op += ip[i]
print(op)

Solution (Python):
s = input()
ans = []
for i in range(len(s)):
    if i % 2 == 0:
        ans.append(s[i])
print("".join(ans))

Solution (Python):
a = input()
count=0
b = len(a)
c = ""
for i in range(b):
    count+=1
    if not(count % 2 == 0):
        c += a[i]
print(c)

Solution (Python):
s=input()
ans=[]
for i in range(len(s)):
    if i%2==0:
        ans.append(s[i])
print("".join(ans))

Solution (Python):
s = list(input())
a = []
b = ''
for i in range(len(s)):
  if i % 2 == 0:
    a.append(s[i])
for j in range(len(a)):
  b += a[j]
print(b)

Solution (Python):
s = input()
text = ""
for i in range(0, len(s), 2):
    text += s[i]
print(text)

Solution (Python):
print(input()[::2])

Solution (Python):
s = list(input())
ans = []
for i in range(len(s)):
    if (i+1) % 2 == 1:
        print(s[i], end = "")

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()

print(s[::2])

Solution (Python):
s = list(map(str,input()))
print("".join([s[i] for i in range(len(s)) if i%2 == 0]))

Solution (Python):
s = input()
a = [c for c in s]

for i in range(0, len(a)):
    if (i+1) % 2 != 0:
        print(a[i], end = '')

print()

Solution (Python):
s=list(input())
n=len(s)
ans=[]
for i in range(n):
    if i%2==0:
        ans+=[s[i]]
ans1="".join(ans)
print(ans1)

Solution (Python):
s = [s for i,s in enumerate(list(input())) if (i+1) % 2 == 1]
print("".join(s))

Solution (Python):
s = input()

for i in range(len(s)):
  if i%2 == 0:
    print(s[i],end="")
print("\n")

Solution (Python):
s = str(input())


print(s[0:len(s):2])

Solution (Python):
s=input()
a=str()
for i in range(len(s)):
  if i % 2 ==0:
    a = a + s[i]
print(a)

Solution (Python):
ans=""
s=input()
for i in range(-(-len(s)//2)):
    ans+=s[2*i]
print(ans)

Solution (Python):
def resolve():
	s=input()
	print(s[::2])
resolve()

Solution (Python):
S = input()
print(S[::2])

Solution (Python):
def print_ans(s):
    """Print substring of s, odd_th char

    Parameters
    --------------
    Examples
    >>> print_ans("a")
    a
    >>> print_ans("ab") 
    a
    >>> print_ans("aibc")
    ab

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

if __name__ == '__main__':
    s = input()
    print_ans(s)

Solution (Python):
Inp = input()
ans = str()

for i in range(1 , len(Inp)+1):
	if i%2 == 1 :
		print(Inp[i-1], end="")

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

Solution (Python):
nl = lambda: list(map(int, input().split()))
sl = lambda: input().split()
n = lambda: int(input())
s = lambda: input()

S = s()
res = ''

for i in range(len(S)):
    if (i+1) % 2 == 1:
        res += S[i]

print(res)

Solution (Python):
S = input()
print(S[::2])

Solution (Python):
s=list(input())
ans=[]

for i in range(len(s)):
    if i%2==0:
        ans.append(s[i])

print("".join(ans))

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

Solution (Python):
def main():
    print(input()[::2])


main()

Solution (Python):
a = list(input())

answer = []
for i in range(len(a)) :
    if i%2 == 0 :
        answer.append(a[i])

print("".join(answer))

Solution (Python):
s = input()

s_out = "".join([s[i] for i in range(0,len(s),2)])


print(s_out)

Solution (Python):
s=input()
for i in range(0,len(s)):
    if (i+1)%2!=0:
        print(s[i],end='')
print('')

Solution (Python):
from sys import stdin
s = (stdin.readline().rstrip())
print(s[0::2])

Solution (Python):


import sys


s = sys.stdin.readline().rstrip()

print(s[::2])

Solution (Python):
import sys
input = sys.stdin.readline

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

Solution (Python):
def abc():
    s = list(input().rstrip())
    print(''.join([x for i, x in enumerate(s) if i % 2 == 0]))


abc()

Solution (Python):

strings = list(input())


for number in range(len(strings)):
  if number % 2 == 0:
    
    print(strings[number], end ="")

Solution (Python):
import bisect
import os
from collections import Counter, deque
from fractions import gcd
from functools import lru_cache
from functools import reduce
import functools
import heapq
import itertools
import math
import numpy as np
import re
import sys
import string

if os.getenv("LOCAL"):
    sys.stdin = open("_in.txt", "r")

sys.setrecursionlimit(2147483647)
INF = float("inf")


S = sys.stdin.readline().rstrip()
print(S[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
a=input()
b=[]
for i in range(0,len(a)):
    if i%2==0:
        b.append(a[i])
answer=b[0]
for i in range(1,len(b)):
    answer=answer+b[i]
print(answer)

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

Solution (Python):
s = input()

print(s[0::2])

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
from collections import defaultdict, Counter
import itertools

def main():
    data = input()
    print(data[::2])



if __name__ == '__main__':
    main()

Solution (Python):
print(input()[::2])

Solution (Python):
s = list(input())

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

Solution (Python):
print(input()[::2])

Solution (Python):
S = input()
S = list(S)
l = []

for i in range(len(S)):
    if i % 2 == 0:
        l.append(S[i])

print(''.join(l))

Solution (Python):


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

if __name__ == "__main__":
    solve()

Solution (Python):
s = input()
cnt = 0
strings = ""
for i in s:
    if cnt % 2 == 0:
        strings = strings + i
    cnt += 1
print(strings)

Solution (Python):
s = list(input())
ans = []
for i in range(len(s)):
    if i % 2 == 0:
        ans.append(s[i])
print("".join(ans))

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

Solution (Python):
print(input()[0::2])

Solution (Python):

import sys


def solve(s: str):
    ret = s[0::2]
    print(ret)
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    s = next(tokens)  
    solve(s)

if __name__ == '__main__':
    main()

Solution (Python):
s = input()

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

Solution (Python):
s = input()
L = ["a"] * ((len(s)+1)//2)
for i in range(0,(len(s)+1)//2):
    L[i] = s[2*i]
print("".join(L))

Solution (Python):


s = input()

print(s[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()

print(s[0::2])

Solution (Python):
S = input()
s = []
for i in range(len(S)):
    if (i + 1) % 2 == 1:
        s.append(S[i])

print(('').join(s))

Solution (Python):
s = input()
index = 0
ans = ''
while index < len(s):
	ans = ans + s[index]
	index += 2
print(ans)

Solution (Python):
s = input()
n = len(s)
if n % 2 == 0:
    for i in range(0, n-1, 2):
        print(s[i], end='')
else:
    for i in range(0, n, 2):
        print(s[i], end='')

Solution (Python):
S=input()
print(S[0::2])

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

Solution (Python):
s = input()
t = ""
for i in range((len(s)+1)//2):
  t += s[2*i]
print(t)

Solution (Python):
s = input()

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

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

Solution (Python):
print(input()[::2])

Solution (Python):
s = list(input())
ans = []
for i in range(len(s)):
    if i % 2 == 0:
        ans.append(s[i])
print("".join(ans))

Solution (Python):
l=input()
print(l[::2])

Solution (Python):

def main():
    s = input()
    s = [s[x] for x in range(len(s)) if (x+1) % 2 == 1]
    print("".join(s))


if __name__ == "__main__":
    main()

Solution (Python):
s=input()
w=[]
for i in range(len(s)//2):
  w.append(s[2*i])
if len(s)%2!=0:
  w.append(s[len(s)-1])
print("".join(w))

Solution (Python):
s = input()
ans = []
for i in range(len(s)):
    if i%2 == 0:
        ans.append(s[i])
print("".join(ans))

Solution (Python):
a = input()
w = ""
for i in range(len(a)):
  if i % 2 == 0:
    w += a[i]
print(w)

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()

print(s[::2])

Solution (Python):
s = input()
odd = ""

for index in range(len(s)):
	if index % 2 == 0:
		odd += s[index]
		
print(odd)

Solution (Python):
S = [c for i, c in enumerate(list(input())) if i % 2 == 0]
print(''.join(S))

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

Solution (Python):
print(input()[0::2])

Solution (Python):
s = input()
ans = ""
for i in range(0,len(s), 2):
    ans += s[i]

print(ans)

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

Solution (Python):
s = input()

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

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

Solution (Python):
s = input()

list_ = []
for i,j in enumerate(s):
    if i%2 == 0:
        list_.append(j)

print(''.join(list_))

Solution (Python):
s = input()

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

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

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()

S = [x for i, x in enumerate(s) if i % 2 == 0]

print(''.join(S))

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

Solution (Python):
s = input()
s_list = []

for i in s:
    s_list.append(i)
for j in range(len(s_list)):
    if j % 2 == 0:
        print(s_list[j],end = "")

Solution (Python):
print(input()[0::2])

Solution (Python):

s = input()
s = list(s)

ans = []
for i in range(len(s)):
    if i % 2 == 0:
        ans.append(s[i])

for i in range(len(ans)):
    print(ans[i],end = '')

Solution (Python):
print("".join([l for i, l in enumerate(input().strip()) if i & 1 == 0]))

Solution (Python):
s=input()
Key=[]
for i in range(0,len(s),2):
    Key.append(s[i])
Key=''.join(Key)
print(Key)

Solution (Python):
S = list(input())
lst=[]
for i in range(int(len(S))):
	if i%2 == 0:
		
		lst.append(S[i])
	i += 2


print("".join(lst))

Solution (Python):
s = input()
print(s[0:len(s):2])

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

Solution (Python):
s = input().rstrip()

print(s[::2])

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

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[0::2])

Solution (Python):
s = input()
ans = ""
for i in range(len(s)//2+1):
    if 2*i < len(s):
      ans += s[2*i]
    else:
        break
print(ans)

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

Solution (Python):
from sys import stdin


def main():
    s = stdin.readline().rstrip()
    print(''.join([x for i, x in enumerate(s) if i % 2 == 0]))


if __name__ == "__main__":
    main()

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

Solution (Python):
print(''.join([_ for i,_ in enumerate(input()) if i%2==0]))

Solution (Python):

s=input()

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

print(a)

Solution (Python):

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

Solution (Python):
s = input()
odd = ""
for _ in range(len(s)):
    if _ % 2 == 0:
        odd += s[_]
print(odd)

Solution (Python):
S = input()

answer = ""
for i, s in enumerate(S):
  if i % 2 == 0:
    answer += s
print(answer)

Solution (Python):
print(input()[::2])

Solution (Python):
s=list(input())
S=[]
for i in range(len(s)//2):
    S.append(s[i*2])
if len(s)%2!=0:
    S.append(s[-1])
print(''.join(S))

Solution (Python):
s = str(input())
word = ""
for i in range(0, len(s)):
        if i % 2 == 0:
                word = word + s[i]
print(word)

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

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()

print(s[::2])

Solution (Python):
s=list(str(input()))
t=[]
if len(s)%2==0:
    for i in range(len(s)//2):
        t.append(s[2*i])
else:
    for i in range((len(s)+1)//2):
        t.append(s[2*i])

print("".join(t))

Solution (Python):
print(input()[0::2])

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

Solution (Python):
s = input()
key = ""
for i in range(len(s)):
    if i % 2 == 0:
        print(s[i], end="")

Solution (Python):
on=""
mo=1
for x in input():
	if mo:
		on+=x
	mo=1-mo
print(on)

Solution (Python):
l=input()
w=""
c=0
while len(w)<len(l)/2:
  w+=l[c]
  c+=2
print(w)

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

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
s=input()
t=[s[i] for i in range(len(s)) if i%2==0]
print(''.join(t))

Solution (Python):
s = str(input())
print(s[0::2])

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

Solution (Python):
x = input()
print(x[::2])

Solution (Python):
s=str(input())
x=[]
for i in range(len(s)):
    if i==0:
        x.append(s[0])
    elif i%2==0:
        x.append(s[i])

ans=''.join(x)
print(ans)

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()
ans = ''

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

print(ans)

Solution (Python):
s = input()

S = ""
for i in range(len(s)):
    if (i+1)%2 == 1:
        S = S + s[i]

print(S)

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

Solution (Python):


S = str(input())
[print(S[i],end="") for i in range(0,len(S),2)]
print()

Solution (Python):
print(input()[0::2])

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

Solution (Python):
s = input()
ans =""
for c in s[::2]:
    ans += c
print(ans)

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

Solution (Python):
S = input()
print(S[0::2])

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

Solution (Python):

def read_input():
    s = input()
    return s

def submit():
    s = read_input()

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




if __name__ == '__main__':
    submit()

Solution (Python):

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

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

Solution (Python):
s=input()

answer=[]
for i,m in enumerate(s):
  if i%2==0:
    answer.append(m)
print("".join(answer))

Solution (Python):
import sys, os

f = lambda:list(map(int,input().split()))
if 'local' in os.environ :
    sys.stdin = open('./input.txt', 'r')

def solve():
    s = input()
    ns = ""
    cnt = 0
    for i in s:
        if cnt%2 ==0:
            ns += i
        cnt+=1
    
    print(ns)
solve()

Solution (Python):
print(input()[::2])

Solution (Python):
S = input()
ans = ""
for s in S[::2]:
    ans += s
print(ans)

Solution (Python):
S = list(input())

ans = []
for i in range(0, len(S), 2):
    ans.append(S[i])
print(''.join(ans))

Solution (Python):
from functools import reduce
import math

def main():
    
    
    
    

    
    
    
    
    
    

    
    

    
    
    
    
    
    
    
    
    
    INF = float("inf")

    
    MOD = 10**9+7
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    

    
    
    
    
    s = input().rstrip()
    ans = ''
    for i in range(len(s)):
        if (i+1) %2 == 1:
            ans = ans + s[i]
    print(ans)
    
if __name__ == '__main__':
    main()

Solution (Python):
print(input()[::2])

Solution (Python):
S = input()

print(S[::2])

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

Solution (Python):
s = input()
s = [s[i] for i in range(len(s)) if i % 2 == 0]
s = "".join(s)
print(s)

Solution (Python):
print(input()[::2])

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

Solution (Python):
print(input()[0:: 2])

Solution (Python):
s = input()

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

Solution (Python):

s=list(str(input()))
x=[]

for i in range(0,len(s),1):
    if i%2==0:
        x.extend(s[i])

ans=''.join(x)
print(ans)

Solution (Python):
print(input()[0::2])

Solution (Python):
a=input()
b=len(a)
for i in range (0,b):
    if i%2==0 :
        print(a[i],end="")

Solution (Python):
a = input()
b = list(a)
c = []

for i in range(0, len(a), 2):
        c.append(b[i])

mojiretu = ''.join(c)

print(mojiretu)

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

Solution (Python):
s= input()

ans=[]

for i in range(0,len(s)):
    if (i+1)%2 != 0:
        ans.append(s[i])

print(''.join(ans))

Solution (Python):
s=input()
x=""
for i in range(0,len(s),2):
    x+=s[i]
print(x)

Solution (Python):
s = [i for i in input()]
print(''.join(s[::2]))

Solution (Python):
s = input()
a = int(len(s)/2)
b = []
if len(s)%2 == 0 :
    for i in range(0,a) :
        b += s[2*i]
    li = ''.join(b)
    print(li)
else :
    for i in range(0,a+1) :
        b += s[2*i]
    li = ''.join(b)
    print(li)

Solution (Python):
s = input()
N = len(s)

ans = ""

i = 0
while i < N:
  ans += s[i]
  i += 2

print(ans)

Solution (Python):
print(input()[::2])

Solution (Python):

s = input()
count = len(s)
t = ""
for i in range(count):
  if (i+1)%2 !=0:
    t=t+s[i]
print(t)

Solution (Python):
print(input()[::2])

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

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[0::2])

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

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

Solution (Python):
string = input()
i = 1
ans = ""
for s in string:
  if i % 2 != 0:
    ans += s
  i += 1
 
print(ans)

Solution (Python):
s=input()
print(s[0:len(s):2])

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

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

Solution (Python):
s = list(input())
AnsList = s[::2]
print(''.join(AnsList))

Solution (Python):
S = input()

ans = ""
for i in range(0,len(S),2):
    ans += S[i]
    
print(ans)

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()
ans = ""
for i in range(len(s)):
    if (i+1)%2 != 0:
        ans += s[i]

print(ans)

Solution (Python):
print(input()[::2])

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

Solution (Python):
s = input()

t = ''
for i in range(0, len(s), 2):
    t += s[i]
print(t)

Solution (Python):
A=input()
B=[]
for i,v in enumerate(A):
    if i%2==0:
         B.append(v)
    else:
        continue
print("".join(B))

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

Solution (Python):
s = str(input())

result = ""
for i in range(len(s)):
    if (i + 1) % 2 != 0:
        result += s[i]
print(result)

Solution (Python):
s = input()

o = ''
for i in range(len(s)):
    if (i+1) % 2 == 1:
        o += s[i]

print(o)

Solution (Python):

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

Solution (Python):
s = input()
ans = ''
i = 1
for c in s:
  if (i % 2 == 1):
    ans += c
  i += 1

print(ans)

Solution (Python):
import sys
ns = lambda: sys.stdin.readline().rstrip()
ni = lambda: int(ns())
nm = lambda: map(int, sys.stdin.readline().split())
nl = lambda: list(nm())

s = list(ns())
ans = []
for i in range(0, len(s), 2):
    ans.append(s[i])
print(''.join(ans))

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

Solution (Python):
s = input()
n = len(s)
a = ""
if n%2==0:
    for i in range(0,n,2):
        a += s[i]
else:
    for i in range(0,n+1,2):
        a += s[i]
print(a)

Solution (Python):
S = list(input())

ss = []
for i in range(0,len(S)):
    if i % 2 == 0:
       ss.append(S[i])

print(''.join(ss))

Solution (Python):
s = input()

a=[]
for i in range(len(s)):
    if((i+1)%2!=0):
        a += s[i]


moziretu = "".join(a)

print(moziretu)

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

Solution (Python):
s = input()
s = "".join([c for i, c in enumerate(s) if i%2 == 0])
print(s)

Solution (Python):


import itertools
import collections
import bisect

def main():
    s = input()
    print(s[0:len(s):2])

if __name__ == '__main__':
    main()

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

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

Solution (Python):
s = str(raw_input())
ans =''
if len(s) % 2 == 0:
	for i in range(len(s) /2):
		ans += s[2 * i]
else:
	for i in range((len(s) + 1) / 2):
		ans += s[2 * i]
print ans

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()

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

print(ans)

Solution (Python):
print(input()[::2])

Solution (Python):
A=list(input())
print("".join(A[::2]))

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

Solution (Python):
S = list(input())
S_odd = S[0::2]
print("".join(S_odd))

Solution (Python):
s = input()

print(s[::2])

Solution (Python):

s = input()
s1 = []
for i in range(int((len(s)+1)/2)):
    print(s[2*i], end="")

Solution (Python):
A_list=list(input())
N=len(A_list)

ans_list=[]

for i in range(N):
    if i%2 == 0:
        ans_list.append(A_list[i])


print("".join(ans_list))

Solution (Python):
s = input()
answer = ""

for i in range(len(s)):
  if i % 2 == 0:
	  answer += s[i]

print(answer)

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()
ans = ""
for i in range(0,len(s),2):
    ans += s[i]
print(ans)

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

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

Solution (Python):
input_str = input()
arr = []

for i in range(len(input_str)):
  if (i + 1) % 2 == 1:
    arr.append(input_str[i])

print ("".join(arr))

Solution (Python):
print(input()[::2])

Solution (Python):


s = list(input())

for i in range(len(s)):
    if i % 2 == 1:
        s[i] = "0"

s = "".join(s)
s = s.replace("0","")

print(s)

Solution (Python):
import sys

def main():
    input = sys.stdin.readline
    ans = ''
    for i, c in enumerate(input().strip()):
        if i % 2 == 0:
            ans += c
    return ans


if __name__ == '__main__':
    print(main())

Solution (Python):

from collections import defaultdict
from collections import deque
from heapq import heappush, heappop
import sys
import math
import bisect
import random
def LI(): return list(map(int, sys.stdin.readline().split()))
def I(): return int(sys.stdin.readline())
def LS():return list(map(list, sys.stdin.readline().split()))
def S(): return list(sys.stdin.readline())[:-1]
def IR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = I()
    return l
def LIR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = LI()
    return l
def SR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = S()
    return l
def LSR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = SR()
    return l
mod = 1000000007




s = S()
for i in range(len(s)):
    if not i%2:
        print(s[i],end = "")
print()

"""
n = I()
d = defaultdict(int)
a = LI()
for i in a:
    d[i] += 1
    d[i+1] += 1
    d[i-1] += 1
d = list(d.values())
print(max(d))
"""


"""
n = I()
a = LI()
k = 0
for i in range(n-1):
    if a[i] == i+1:
        x = a[i]
        a[i] = a[i+1]
        a[i+1] = x
        k += 1
if a[n-1] == n:k += 1
print(k)
"""

Solution (Python):
s = list(input())
ans =  "".join(s[::2])
print(ans)

Solution (Python):
hoge=list(input())
huga=[]

for i in range(len(hoge)):
  if((i+1)%2==1):
    huga.append(hoge[i])
for i in range(len(huga)):
  print(huga[i], end="")

Solution (Python):
s = input()
print(s[0:len(s):2])

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

Solution (Python):
s = list(input())
for i, c in enumerate(s):
    if i % 2 == 0:
        print(c, end='')
print('')

Solution (Python):
print(input()[::2])

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

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

Solution (Python):
s = str(input())
a = s[::2]
print(a)

Solution (Python):
s = str(input())
a = s[::2]
print(a)

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

Solution (Python):
S = list(input())
for i, s in enumerate(S):
  if i % 2 == 0:
    print(s, end='')

Solution (Python):

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

Solution (Python):
print(str(input())[::2])

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

Solution (Python):
print(input()[::2])

Solution (Python):
s,ans=input(),""
for i in range((len(s)+1)//2):ans+=s[i*2]
print(ans)

Solution (Python):
def odd_string(s: str)->str:
    return ''.join(c for i, c in enumerate(s) if i % 2 == 0)


if __name__ == "__main__":
    s = input()
    ans = odd_string(s)
    print(ans)

Solution (Python):
s=list(input())
q=[]
for i in range(0,len(s),2):
  q.append(s[i])
print(''.join(q))

Solution (Python):
print(input()[::2])

Solution (Python):
a=input()

ans=""
for i in range(0,len(a),2):
  ans+=a[i]

print(ans)

Solution (Python):
s=input()

ans=''

for i in range(0,len(s),2):
    ans+=s[i]

print(ans)

Solution (Python):
s = str(input())
s_list = []
char_len = len(s)
for i in range(char_len):
        if i % 2 == 0:
                s_list.append(s[i])
        else:
                continue
char = "".join(s_list)
print(char)

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

Solution (Python):
s = input()

n = len(s)

ans = ''

for i in range(n):
	if (i+1) % 2 == 1:
		ans += s[i]
	     
        
print(ans)

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

Solution (Python):
s = list(input())
ans = ''
for j in s[0:len(s):2]:
    ans += j
print(ans)

Solution (Python):
s=input()
print(s[0:len(s):2])

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

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

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

Solution (Python):
import heapq
from collections import deque
from enum import Enum
import sys
import math
from _heapq import heappush, heappop

BIG_NUM = 2000000000
MOD = 1000000007
EPS = 0.000000001



T = input()

for i in range(len(T)):
    if  i%2 == 0:
        print("%c"%(T[i]),end="")

print("")

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()

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

print(res)

Solution (Python):
s=input()
ans=""
for i in range(0,len(s),2):
    ans+=s[i]
print(ans)

Solution (Python):
s = list(input())
result = ""
for i in range(len(s)):
    if (i+1) % 2 != 0:
        result += s[i]
print(result)

Solution (Python):
s = input()

ans = ""
for i in range(0, len(s), 2):
    ans += s[i]

print(ans)

Solution (Python):
s = [i for num,i in enumerate(input()) if num%2==0]
print("".join(s))

Solution (Python):
print(input()[::2])

Solution (Python):
print(input()[::2])

Solution (Python):
s = input()
ans = "" 
for i in range(0,len(s),2): 
  ans += s[i]
print(ans)

Solution (Python):
def main():
    s = input()
    print(s[::2])


if __name__ == "__main__":
    main()

Solution (Python):
print(input()[::2])

Solution (Python):
a = input()
print(a[::2])

Solution (Python):
print(input()[::2])

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

Solution (Python):
s = input()

l = list(s)
ln = l[0::2]
print("".join(ln))

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

Solution (Python):
s = input()
n = len(s)
ans = ""

for i in range(n):
    if i%2 == 0:
        ans += s[i]

print(ans)

Solution (Python):
s=input()
n=0
ans=""
for i in range(len(s)):
    if n%2==0:ans+=s[i]
    n+=1
print(ans)

Solution (Python):
print(input()[::2])

Solution (Python):
"""AtCoder"""

S = input()

ans = ''

for i in range(0, len(S), 2):
    ans += S[i]

print(ans)

Solution (Python):
print(input()[::2])