
# 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:

def iput(): return int(eval(input()))

def mput(): return list(map(int, input().split()))

def lput(): return list(map(int, input().split()))



def solve():

    a, b = mput()

    print((a*b))

    return 0



if __name__ == "__main__":

    solve()

# optimized version of the same code:

import math

def solve():

    a, b = input().split()

    a = int(a)

    b = float(b)

    print((int(a*b)))

    return 0

 

if __name__ == "__main__":

    solve()
def iput():
    return int(eval(input()))


def mput():
    return list(map(int, input().split()))


def lput():
    return list(map(int, input().split()))


def solve():
    a, b = mput()
    print((a * b))
    return 0


if __name__ == "__main__":
    solve()

import math


def solve():
    a, b = input().split()
    a = int(a)
    b = float(b)
    print((int(a * b)))
    return 0


if __name__ == "__main__":
    solve()

-def iput(): -    return int(eval(input())) - - -def mput(): -    return list(map(int, input().split())) - - -def lput(): -    return list(map(int, input().split())) +import math -    a, b = mput() -    print((a * b)) +    a, b = input().split() +    a = int(a) +    b = float(b) +    print((int(a * b)))