
# slower version:

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


# optimized version of the same code:

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



# slower version:

import numpy as np

import sys



n = int(eval(input()))

a = np.array(list(map(int, input().split())))



cnt = 1



if np.any(a%2==1):

    print((0))

    sys.exit()



while True:

    a2 = a % 2**cnt

    if np.all(a2==0):

        cnt += 1

        continue

    else:

        print((cnt-1))

        break

# optimized version of the same code:

N = int(eval(input()))

a = list(map(int,input().split()))

ans = 0

while all(A%2 == 0 for A in a):

	a = [i/2 for i in a ]

	ans += 1

print(ans)

import numpy as np
import sys

n = int(eval(input()))
a = np.array(list(map(int, input().split())))
cnt = 1
if np.any(a % 2 == 1):
    print((0))
    sys.exit()
while True:
    a2 = a % 2**cnt
    if np.all(a2 == 0):
        cnt += 1
        continue
    else:
        print((cnt - 1))
        break

N = int(eval(input()))
a = list(map(int, input().split()))
ans = 0
while all(A % 2 == 0 for A in a):
    a = [i / 2 for i in a]
    ans += 1
print(ans)

-import numpy as np -import sys - -n = int(eval(input())) -a = np.array(list(map(int, input().split()))) -cnt = 1 -if np.any(a % 2 == 1): -    print((0)) -    sys.exit() -while True: -    a2 = a % 2**cnt -    if np.all(a2 == 0): -        cnt += 1 -        continue -    else: -        print((cnt - 1)) -        break +N = int(eval(input())) +a = list(map(int, input().split())) +ans = 0 +while all(A % 2 == 0 for A in a): +    a = [i / 2 for i in a] +    ans += 1 +print(ans)