
# 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:

x = int(eval(input()))



for a in range(-118, 120):

    for b in range(-119, 119):

        if a**5-b**5 == x:

            print((a, b))

            exit()

# optimized version of the same code:

x = int(eval(input()))



for a in range(1, 120):

    for b in range(-119, 119):

        if a**5-b**5 == x:

            print((a, b))

            exit()
x = int(eval(input()))
for a in range(-118, 120):
    for b in range(-119, 119):
        if a**5 - b**5 == x:
            print((a, b))
            exit()

x = int(eval(input()))
for a in range(1, 120):
    for b in range(-119, 119):
        if a**5 - b**5 == x:
            print((a, b))
            exit()

-for a in range(-118, 120): +for a in range(1, 120):