
# 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()))

a = 0

b = 0

for i in range(-120, 120):

    for j in range(-120, 120):

        if i ** 5 - j ** 5 == x:

            a = i

            b = j

print((a, b))


# optimized version of the same code:

x = int(eval(input()))

for i in range(-120, 120):

    for j in range(-120, 120):

        if i ** 5 - j ** 5 == x:

            print((i, j))

            exit()

x = int(eval(input()))
a = 0
b = 0
for i in range(-120, 120):
    for j in range(-120, 120):
        if i**5 - j**5 == x:
            a = i
            b = j
print((a, b))

x = int(eval(input()))
for i in range(-120, 120):
    for j in range(-120, 120):
        if i**5 - j**5 == x:
            print((i, j))
            exit()

-a = 0 -b = 0 -            a = i -            b = j -print((a, b)) +            print((i, j)) +            exit()