
# 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 math

n = int(eval(input()))

print((math.factorial(n)%(10**9+7)))


# optimized version of the same code:

n = int(eval(input()))

mod = 10**9 + 7



pow = 1

for i in range(n):

    pow = pow*(i+1)%mod



print(pow)

import math

n = int(eval(input()))
print((math.factorial(n) % (10**9 + 7)))

n = int(eval(input()))
mod = 10**9 + 7
pow = 1
for i in range(n):
    pow = pow * (i + 1) % mod
print(pow)

-import math - -print((math.factorial(n) % (10**9 + 7))) +mod = 10**9 + 7 +pow = 1 +for i in range(n): +    pow = pow * (i + 1) % mod +print(pow)