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())
ans = ''

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

Solution (Python):
s = input()

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

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

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

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

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

Solution (Python):
S=input()
N=len(S)
ans=""
for i in range(1,N+1):
    if i%2!=0:
        ans+=S[i-1]
    else:
        continue
print(ans)

Solution (Python):
s = input()

print(s[0::2])

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

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

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

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

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

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

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

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

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

Solution (Python):

"""
Created on Wed Feb 27 01:06:34 2019

@author: yuta
"""

def oddstring(s):
    print(s[::2])

oddstring(input())

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

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

Solution (Python):
s = input()
t = ''
for i in range(len(s)):
    if (i + 1) % 2 != 0:
      t += s[i]
print(t)

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

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

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

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

Solution (Python):
from statistics import mean, median,variance,stdev
import numpy as np
import sys
import math
import fractions
import itertools

def j(q):
    if q==1: print("Yes")
    else:print("No")
    exit(0)


def ct(x,y):
    if (x>y):print("")
    elif (x<y): print("")
    else: print("")

def ip():
    return int(input())

def swap(s,pos):
    s[pos]-=1
    s[pos+1]+=1
    print(s)
    if pos == n-2: return s
    if s[pos+2] == 0: swap(s,pos+1)
    return s







a = input()                                  






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

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

Solution (Python):
s = input()
t = ''
for i in range(len(s)):
    if ( (i + 1) % 2 ) != 0:
        t += s[i]
print(t)

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

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

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

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

Solution (Python):
s=str(input())
l_s=[]
for i in range(len(s)):
	if((i+1)%2!=0):
		l_s.append(s[i])

odd=''.join(l_s)
print(odd)

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

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

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

Solution (Python):

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

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

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

Solution (Python):
s = input()
c = 0
answer = ''
for a in s:
  c+=1
  if c%2==1:
    answer += ''.join(a)
print(answer)

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

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

Solution (Python):
print("".join([v for k,v in enumerate(list(input())) if k%2==0]))

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

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

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

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

Solution (Python):
s = input()

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

print()

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

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

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

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

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

Solution (Python):
S=input()
i=0
mozi=""
while i<len(S):
    mozi=mozi+S[i]
    i=i+2
print(mozi)

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

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

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

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

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

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

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

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

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

Solution (Python):
def main():
    s = input()
    ans = ""
    for i, si in enumerate(s):
        if (i + 1) % 2 == 1:
            ans += si

    print(ans)


if __name__ == '__main__':
    main()

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

Solution (Python):
s = input()

print(s[::2])

Solution (Python):
s = input()

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

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

Solution (Python):
import sys





S = str(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):

def db(x): 
    global debug
    if debug: print(x)
debug = False
S = input()
res = [S[i] for i in range(len(S)) if i%2==0 ]
print(''.join(res))

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

print(ans)

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

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

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

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

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

print(ans)

Solution (Python):

import sys

s = list(input())

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

print(res)

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

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

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

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

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

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())
s=s[::2]
print("".join(s))

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

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

Solution (Python):
import sys

input = sys.stdin.readline
s = input()
print(s[::2])

Solution (Python):
s = input()
words = ''
i = 0
while 2 * i < len(s):
    words += s[2*i]
    i += 1
print(words)

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

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

Solution (Python):
def abc072_b():
    s = input()
    print("".join(s[::2]))


abc072_b()

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

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

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

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

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

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

Solution (Python):



def main():
    """Function."""
    s = str(input())

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


if __name__ == "__main__":
    main()

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

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


if __name__ == '__main__':
    main()

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

Solution (Python):
s = input()
s = list(s)
a = s[::2]
res = ""
for x in a:
    res += x
print(res)

Solution (Python):

S = str(input())
a=[]
for i in range(len(S)):
  if i % 2 == 0:
    a.append(S[i])
print("".join(a))

Solution (Python):
s = map(str,(raw_input()))
SS = []
SS.append(s[0])
for i in range(1,len(s)):
  if i%2==0:
    SS.append(s[i])
SS = ''.join(SS)
print SS

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

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

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

Solution (Python):




def oddString(dataStr) :
	answerStrList = []
	rangeSelectStr = range(0,len(dataStr),2)
	for i in rangeSelectStr:
		answerStrList.append(dataStr[i])

	answerStr = ''.join(answerStrList)
	return answerStr


if __name__ == '__main__':
	inputLine = input()
	inputStr = inputLine
	ans=oddString(inputStr)
	print(ans)

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

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

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

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

Solution (Python):

print(input()[::2])

Solution (Python):

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

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

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

print(a)

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

Solution (Python):
print "".join([c for i, c in enumerate(raw_input()) if (i + 1) % 2 != 0])

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

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

Solution (Python):
s = raw_input()
print "".join([s[i] for i in range(len(s)) if (i + 1) % 2 == 1])

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

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

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

print(t)

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

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

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

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

Solution (Python):
s = input()

print(s[::2])

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

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

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

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

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

for i in range(len(a)):
  if i % 2 != 1:
    b.append(a[i])
    
print("".join(b))

Solution (Python):
S = input()

print(S[::2])

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

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

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

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

print(x)

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

i = 0
ns = ''
while i < len(s):
    ns += s[i]
    i += 2

print(ns)

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

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

print(''.join(s))

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

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

Solution (Python):
text = input()
new_text_li = []
for i in range(len(text)):
    if i % 2 == 0:
        new_text_li.append(text[i])

new_text = "".join(new_text_li)
print(new_text)

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

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

print(ans)

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

Solution (Python):


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

Solution (Python):
s = list(input())
ans_l = s[::2]
ans = ''
for i in range(len(ans_l)):
	ans += ans_l[i]

print(ans)

Solution (Python):
from sys import stdin


def main() -> None:
    s = next_str()
    print(s[::2])


def next_str() -> str:
    result = ""
    while True:
        tmp = stdin.read(1)
        if tmp.strip() != "":
            result += tmp
        elif tmp != '\r':
            break
    return result


if __name__ == '__main__':
    main()

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

print(re)

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

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

Solution (Python):
s = input()
ans = str()
for i in range(0,len(s),2):
  ans += s[i:i+1]
print(ans)

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

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

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

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

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

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

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

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

Solution (Python):
S = input()

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

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

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

Solution (Python):
s = input()

print(s[::2])

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

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

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

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

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

Solution (Python):
s = input()

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

Solution (Python):
s = input()

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

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

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

def li(): return map(int, stdin.readline().split())
def li_(): return map(lambda x: int(x)-1, stdin.readline().split())
def lf(): return map(float, stdin.readline().split())
def ls(): return stdin.readline().split()
def ns(): return stdin.readline().rstrip()
def lc(): return list(ns())
def ni(): return int(stdin.readline())
def nf(): return float(stdin.readline())

s = ns()

print(s[::2])

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

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

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

index=0
stA=""
while index < len(listS):
    if index%2==0:
        stA+=listS[index]
    index+=1

print(stA)

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 = input()

print(s[::2])

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

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

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

Solution (Python):
s = input()
if len(s) % 2 > 0:
    print(s[0:-1:2] + s[-1])
else:
    print(s[0:-1:2])

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

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

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

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

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

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

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

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

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

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

Solution (Python):
s = input()
s = [h for i, h in enumerate(s, 1) if i % 2 != 0]
print("".join(s))

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

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

Solution (Python):
from collections import defaultdict, Counter
from itertools import product, groupby, count, permutations, combinations
from math import pi, sqrt
from collections import deque
from bisect import bisect, bisect_left, bisect_right
from string import ascii_lowercase
from functools import lru_cache
import sys
sys.setrecursionlimit(10000)
INF = float("inf")
YES, Yes, yes, NO, No, no = "YES", "Yes", "yes", "NO", "No", "no"
dy4, dx4 = [0, 1, 0, -1], [1, 0, -1, 0]
dy8, dx8 = [0, -1, 0, 1, 1, -1, -1, 1], [1, 0, -1, 0, 1, 1, -1, -1]

def inside(y, x, H, W):
    return 0 <= y < H and 0 <= x < W


def ceil(a, b):
    return (a + b - 1) // b


def main():
    s = input()
    print("".join(s[i] for i in range(0, len(s), 2)))


if __name__ == '__main__':
    main()

Solution (Python):



def main():
    s = raw_input()
    print(s[::2])


if __name__ == "__main__":
    main()

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

Solution (Python):
s = input()

print(s[::2])

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

Solution (Python):
S = input()

i = 0
while i < len(S):
  print(S[i], end="")
  i += 2

print()

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

Solution (Python):
s = input()

print(s[::2])

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

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

Solution (Python):
import sys
import math
import collections
import itertools
import array
import inspect


sys.setrecursionlimit(10000)



def chkprint(*args):
    names = {
        id(v): k
        for k, v in inspect.currentframe().f_back.f_locals.items()
    }
    print(', '.join(
        names.get(id(arg), '???') + ' = ' + repr(arg) for arg in args))



def to_bin(x):
    return bin(x)[2:]


def li_input():
    return [int(_) for _ in input().split()]




dp = None


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


main()

Solution (Python):
from collections import deque
S = list(input())
ans = ''
cnt = 0
for x in S:
    if cnt == 0:
        ans += x
    cnt = (cnt+1)%2
print(ans)

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.append(s[i])
print(''.join(ans))

Solution (Python):
s = raw_input()
ans = ''
for i in range(len(s)):
    if i & 1 == 0:
        ans += s[i]
print ans

Solution (Python):
s = raw_input()
ans = ''
for i in range(len(s)):
    if i & 1 == 0:
        ans += s[i]
print ans

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

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

Solution (Python):


def main():
    s = input()
    ans = ''
    for i in range(1, len(s) + 1):
        if i % 2 != 0:
            ans += s[i - 1]

    print(ans)

if __name__ == '__main__':
    main()

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

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

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

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

Solution (Python):
s = input()

print(s[::2])

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

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

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

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

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

Solution (Python):
s = input()

print(s[::2])

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

Solution (Python):
list = input();

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

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

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

Solution (Python):
s = input()

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

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

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

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

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

Solution (Python):
s = input()

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

print(ans)

Solution (Python):
word = input()

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

print(output_string)

Solution (Python):
a = input()
counter = 1
b =""
 
for x in a:
    if counter %2 == 0:
        pass
    else:
        b +=x
    counter +=1
 
print(b)

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

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

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

ans=[]

for i in range(len(S)):
    if i%2==0:
        ans+=S[i]
        
ans2=''.join(ans)
        
print(ans2)

Solution (Python):


from functools import reduce
from operator import add

s = list(input())

print(reduce(add, [s for (i, s) in enumerate(s) if i % 2 == 0]))

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

Solution (Python):
s = input()
i = 0;
while(2*i < len(s)):
    print(s[2*i],end = "")
    i+=1

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 + 1) % 2 != 0:
        ans += s[i]
print(ans)

Solution (Python):
s = input()
s2 = ''

for i, v in enumerate(s, 1):
    if i % 2 == 1:
        s2 += v
print(s2)

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

Solution (Python):


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

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

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

Solution (Python):
import math


s = input()

ans = ''

for i in range(math.ceil(len(s) / 2)):
    ans = ans + s[2 * i]

print(ans)

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

Solution (Python):


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

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

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

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

Solution (Python):
s = input()

res = ''
for i in range(1,len(s)+1):
    if i % 2 != 0:
        res += s[i-1]

print(res)

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

print(res)

Solution (Python):
s = input()

output = ''
for i, char in enumerate(s):
  if (i+1)%2 != 0:
    output = output + char
print(output)

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

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

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=input()
output=""
for index, character in enumerate(s):
    if (index+1)%2 == 1:
        output = output + character
print(output)

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

Solution (Python):
str = input()


i = 0
str_odd = ""

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

print(str_odd)

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

print(ans)

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

Solution (Python):
retsu=input()
nagasa=len(retsu)
for i in range(1,nagasa):
        retsu=retsu[0:i]+retsu[i+1:]
print(retsu)

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

Solution (Python):
S = input()
c = 0
for s in S:
    c += 1
    if c%2:
        print(s,end='')

Solution (Python):
s = input()

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

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

Solution (Python):
str = input('')
chars = [str[x] for x in range(len(str)) if x % 2 == 0]
print(''.join(chars))

Solution (Python):
s=input()
ans=s[0]

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

print(ans)

Solution (Python):
s = raw_input()
i = 0
ans = ''
while 2*i < len(s):
	ans = ans + s[2*i]
	i = i + 1
print ans

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

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

Solution (Python):
s = input()

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

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

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

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

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

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

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

print("".join(odd_s))

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

Solution (Python):
s = input()
s1 = s[0]
for i in range (len(s)):
    if i%2 == 0 and i > 0:
        s1 += s[i]
print(s1)

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

Solution (Python):


s = input()

print(s[::2])

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

Solution (Python):
s=input()

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

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

t = []
for i in range(len(s)):
    if i % 2 == 0:
        t.append(s[i])
    else:
        None
        
q = ''
for j in t:
    q = q + j
print(q)

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

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

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

Solution (Python):
import sys

stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()

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

Solution (Python):
n = list(input())
strings = []
for i in range(len(n)):
    if i % 2 == 0:
        strings.append(n[i])

print(('').join(strings))

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

Solution (Python):
OS_list = list(input())
Output_str =""

for i, j in enumerate(OS_list):
    if (i+1)%2 ==1:
        Output_str += j
    else:
        pass
      
print(Output_str)

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

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

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

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

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

Solution (Python):
import math
import sys

def getinputdata():

    
    array_result = []
    
    data = input()

    
    array_result.append(data.split(" "))

    flg = 1

    try:


        while flg:

            data = input()

            array_temp = []

            if(data != ""):
                
                array_result.append(data.split(" "))

                flg = 1

            else:

                flg = 0
    finally:


        return array_result





arr_data = getinputdata()

s = arr_data[0][0]

chkflg=True



strresult=""
for v in range(0,len(s)):
    

    
    if chkflg:
        
        strresult+=s[v]
        chkflg=False
       
    else:
        
        chkflg=True
        
        
print(strresult)

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

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

Solution (Python):

st_data=input()
odd=""
for i in range(len(st_data)):
    if (i+1)%2==1:odd+=st_data[i]
print(odd)

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

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

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

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

print(t)

Solution (Python):





if __name__ == '__main__':
    s = list(str(input()))
    result = s[::2]
    print(''.join(result))

Solution (Python):
s = input()
ind = 0
result = ''
while ind <=  len(s)-1:
  result = result + s[ind]
  ind += 2
print(result)

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

Solution (Python):
s = input()
res = s[0]

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

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

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

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

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

Solution (Python):


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

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

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

Solution (Python):
s = input()
n = len(s)
i = 0
ans = []
while i < n:
	ans.append(s[i])
	i += 2
e = len(ans)
for i in range(e):
	if i != e-1:
		print(ans[i],end = '')
	else:
		print(ans[i])

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

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

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

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