
# 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(-200, 200):

    find = False

    for b in range(-200, 200):

        x = a**5-b**5

        if x == X:

            find = True

            print((a, b))

            break

    if find:

        break


# optimized version of the same code:



X = int(eval(input()))

for a in range(-120, 120):

    find = False

    for b in range(-120, 120):

        x = a**5-b**5

        if x == X:

            find = True

            print((a, b))

            break

    if find:

        break

X = int(eval(input()))
for a in range(-200, 200):
    find = False
    for b in range(-200, 200):
        x = a**5 - b**5
        if x == X:
            find = True
            print((a, b))
            break
    if find:
        break

X = int(eval(input()))
for a in range(-120, 120):
    find = False
    for b in range(-120, 120):
        x = a**5 - b**5
        if x == X:
            find = True
            print((a, b))
            break
    if find:
        break

-for a in range(-200, 200): +for a in range(-120, 120): -    for b in range(-200, 200): +    for b in range(-120, 120):