
# 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, b, c, x, y = list(map(int, input().split()))

# print(a, b, c, x, y)



ans = 10000 * (10 **5) + 7

c_max = 0

if x > y:

  c_max = x * 2

else:

  c_max = y * 2



for cc in range(c_max+1):

  ac = x - (cc // 2)

  bc = y - (cc // 2)

  

  if ac < 0:

    ac = 0

  if bc < 0:

    bc = 0

  price = ac * a + bc * b + cc * c

  # print('price: {}, ac: {}, bc: {}, cc: {}'.format(price, ac, bc, cc))

  ans = min(ans, price)



print(ans)

# optimized version of the same code:

a, b, c, x, y = list(map(int, input().split()))

# print(a, b, c, x, y)



ans = 10000 * (10 **5) + 7

c_max = 0

if x > y:

  c_max = x * 2

else:

  c_max = y * 2



for cc in range(0, c_max+1, 2):

  ac = x - (cc // 2)

  bc = y - (cc // 2)

  

  if ac < 0:

    ac = 0

  if bc < 0:

    bc = 0

  price = ac * a + bc * b + cc * c

  # print('price: {}, ac: {}, bc: {}, cc: {}'.format(price, ac, bc, cc))

  ans = min(ans, price)



print(ans)

  
a, b, c, x, y = list(map(int, input().split()))
# print(a, b, c, x, y)
ans = 10000 * (10**5) + 7
c_max = 0
if x > y:
    c_max = x * 2
else:
    c_max = y * 2
for cc in range(c_max + 1):
    ac = x - (cc // 2)
    bc = y - (cc // 2)
    if ac < 0:
        ac = 0
    if bc < 0:
        bc = 0
    price = ac * a + bc * b + cc * c
    # print('price: {}, ac: {}, bc: {}, cc: {}'.format(price, ac, bc, cc))
    ans = min(ans, price)
print(ans)

a, b, c, x, y = list(map(int, input().split()))
# print(a, b, c, x, y)
ans = 10000 * (10**5) + 7
c_max = 0
if x > y:
    c_max = x * 2
else:
    c_max = y * 2
for cc in range(0, c_max + 1, 2):
    ac = x - (cc // 2)
    bc = y - (cc // 2)
    if ac < 0:
        ac = 0
    if bc < 0:
        bc = 0
    price = ac * a + bc * b + cc * c
    # print('price: {}, ac: {}, bc: {}, cc: {}'.format(price, ac, bc, cc))
    ans = min(ans, price)
print(ans)

-for cc in range(c_max + 1): +for cc in range(0, c_max + 1, 2):