
# 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:

# AtCoder Beginner Contest 095 C - Half and Half

import sys



A, B, C, X, Y = list(map(int, sys.stdin.readline().strip().split()))



ans = A * X + B * Y

for z in range(2, 2 * 10 ** 5 + 1, 2):

    x = max(X - int(z / 2), 0)

    y = max(Y - int(z / 2), 0)



    price = A * x + B * y + C * z

    ans = min(price, ans)



print(ans)


# optimized version of the same code:

# AtCoder Beginner Contest 095 C - Half and Half

import sys



A, B, C, X, Y = list(map(int, sys.stdin.readline().strip().split()))



"""

ans = A * X + B * Y

for z in range(2, 2 * 10 ** 5 + 1, 2):

    x = max(X - int(z / 2), 0)

    y = max(Y - int(z / 2), 0)



    price = A * x + B * y + C * z

    ans = min(price, ans)



print(ans)

"""



price1 = A * X + B * Y

price2 = C * 2 * X + B * max(Y - X, 0)

price3 = A * max(X - Y, 0) + C * 2 * Y

print((min(price1, price2, price3)))



# AtCoder Beginner Contest 095 C - Half and Half
import sys

A, B, C, X, Y = list(map(int, sys.stdin.readline().strip().split()))
ans = A * X + B * Y
for z in range(2, 2 * 10**5 + 1, 2):
    x = max(X - int(z / 2), 0)
    y = max(Y - int(z / 2), 0)
    price = A * x + B * y + C * z
    ans = min(price, ans)
print(ans)

# AtCoder Beginner Contest 095 C - Half and Half
import sys

A, B, C, X, Y = list(map(int, sys.stdin.readline().strip().split()))
"""
ans = A * X + B * Y
for z in range(2, 2 * 10 ** 5 + 1, 2):
    x = max(X - int(z / 2), 0)
    y = max(Y - int(z / 2), 0)
    price = A * x + B * y + C * z
    ans = min(price, ans)
print(ans)
"""
price1 = A * X + B * Y
price2 = C * 2 * X + B * max(Y - X, 0)
price3 = A * max(X - Y, 0) + C * 2 * Y
print((min(price1, price2, price3)))

+""" -for z in range(2, 2 * 10**5 + 1, 2): +for z in range(2, 2 * 10 ** 5 + 1, 2): +""" +price1 = A * X + B * Y +price2 = C * 2 * X + B * max(Y - X, 0) +price3 = A * max(X - Y, 0) + C * 2 * Y +print((min(price1, price2, price3)))