
# 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:

a=input().split()

b=list(map(int,a))

W=b[0]

H=b[1]

x=b[2]

y=b[3]

r=b[4]

if (r <= x <= (W - r)) and (r <= y <= (H - r)):

  print('Yes')

else:

  print('No')

# optimized version of the same code:

W,H,x,y,r = [int(i) for i in input().split()]

if (r <= x <= (W - r)) and (r <= y <= (H - r)):

  print('Yes')

else:

  print('No')
a = input().split()
b = list(map(int, a))
W = b[0]
H = b[1]
x = b[2]
y = b[3]
r = b[4]
if (r <= x <= (W - r)) and (r <= y <= (H - r)):
    print("Yes")
else:
    print("No")

W, H, x, y, r = [int(i) for i in input().split()]
if (r <= x <= (W - r)) and (r <= y <= (H - r)):
    print("Yes")
else:
    print("No")

-a = input().split() -b = list(map(int, a)) -W = b[0] -H = b[1] -x = b[2] -y = b[3] -r = b[4] +W, H, x, y, r = [int(i) for i in input().split()]