
# 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

w = eval(input())

countn = np.zeros(26)

ew = "abcdefghijklmnopqrstuvwxyz"

i = 0

while i < 26:

    countn[i] = w.count(ew[i])

    if countn[i] %2 != 0:

        print("No")

        sys.exit()

    i +=1

  

print("Yes")

    

    

# optimized version of the same code:

#ABC044B

w = eval(input())

l = len(w)

sig = 0



for i in range(l):

    if w.count(w[i])%2 !=0:

        sig = 1

        break



if sig == 1:

    print("No")

else:

    print("Yes")
import numpy as np
import sys

w = eval(input())
countn = np.zeros(26)
ew = "abcdefghijklmnopqrstuvwxyz"
i = 0
while i < 26:
    countn[i] = w.count(ew[i])
    if countn[i] % 2 != 0:
        print("No")
        sys.exit()
    i += 1
print("Yes")

# ABC044B
w = eval(input())
l = len(w)
sig = 0
for i in range(l):
    if w.count(w[i]) % 2 != 0:
        sig = 1
        break
if sig == 1:
    print("No")
else:
    print("Yes")

-import numpy as np -import sys - +# ABC044B -countn = np.zeros(26) -ew = "abcdefghijklmnopqrstuvwxyz" -i = 0 -while i < 26: -    countn[i] = w.count(ew[i]) -    if countn[i] % 2 != 0: -        print("No") -        sys.exit() -    i += 1 -print("Yes") +l = len(w) +sig = 0 +for i in range(l): +    if w.count(w[i]) % 2 != 0: +        sig = 1 +        break +if sig == 1: +    print("No") +else: +    print("Yes")