
# 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()))



power = math.factorial(n)



print((power % (10**9 + 7)))


# optimized version of the same code:

import math

n = int(eval(input()))



power = 1



for i in range(1, n+1):

    power = i * power % (10**9 + 7)



print(power)

import math

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

import math

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

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