
# 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

x = int(eval(input()))

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

# optimized version of the same code:

M = 1000000007

n=int(eval(input()))

f = 1

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

    f = (f * i) % M 

print(f)
import math

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

M = 1000000007
n = int(eval(input()))
f = 1
for i in range(1, n + 1):
    f = (f * i) % M
print(f)

-import math - -x = int(eval(input())) -print((math.factorial(x) % (10**9 + 7))) +M = 1000000007 +n = int(eval(input())) +f = 1 +for i in range(1, n + 1): +    f = (f * i) % M +print(f)