
# 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:

# https://atcoder.jp/contests/abc129/tasks/abc129_c

# 典型的なDP



MOD = 10**9 + 7

import numpy as np

# dp[i]をi段目までの通りの数とする。

N, M = list(map(int, input().split()))

to_zero = np.full((N + 1), False).tolist()

for _ in range(M):

    to_zero[int(eval(input()))] = True  # 床が抜けているところ



# dpテーブルの用意

dp = np.full((N + 1), -1).tolist()

dp[0] = 1

dp[1] = 0 if to_zero[1] else 1

for i in range(2, N + 1):

    dp[i] = 0 if to_zero[i] else dp[i - 2] + dp[i - 1]

    if dp[i] > MOD:

        dp[i] %= MOD



print((dp[-1]))


# optimized version of the same code:

# https://atcoder.jp/contests/abc129/tasks/abc129_c

# 典型的なDP





def full(shape, full_value):

    if isinstance(shape, tuple):

        NotImplementedError()

    else:

        return [full_value] * shape





MOD = 10**9 + 7

# dp[i]をi段目までの通りの数とする。

N, M = list(map(int, input().split()))

to_zero = full((N + 1), False)

for _ in range(M):

    to_zero[int(eval(input()))] = True  # 床が抜けているところ



# dpテーブルの用意

dp = full((N + 1), -1)

dp[0] = 1

dp[1] = 0 if to_zero[1] else 1

for i in range(2, N + 1):

    dp[i] = 0 if to_zero[i] else dp[i - 2] + dp[i - 1]

    if dp[i] > MOD:

        dp[i] %= MOD



print((dp[-1]))

# https://atcoder.jp/contests/abc129/tasks/abc129_c
# 典型的なDP
MOD = 10**9 + 7
import numpy as np

# dp[i]をi段目までの通りの数とする。
N, M = list(map(int, input().split()))
to_zero = np.full((N + 1), False).tolist()
for _ in range(M):
    to_zero[int(eval(input()))] = True  # 床が抜けているところ
# dpテーブルの用意
dp = np.full((N + 1), -1).tolist()
dp[0] = 1
dp[1] = 0 if to_zero[1] else 1
for i in range(2, N + 1):
    dp[i] = 0 if to_zero[i] else dp[i - 2] + dp[i - 1]
    if dp[i] > MOD:
        dp[i] %= MOD
print((dp[-1]))

# https://atcoder.jp/contests/abc129/tasks/abc129_c
# 典型的なDP
def full(shape, full_value):
    if isinstance(shape, tuple):
        NotImplementedError()
    else:
        return [full_value] * shape


MOD = 10**9 + 7
# dp[i]をi段目までの通りの数とする。
N, M = list(map(int, input().split()))
to_zero = full((N + 1), False)
for _ in range(M):
    to_zero[int(eval(input()))] = True  # 床が抜けているところ
# dpテーブルの用意
dp = full((N + 1), -1)
dp[0] = 1
dp[1] = 0 if to_zero[1] else 1
for i in range(2, N + 1):
    dp[i] = 0 if to_zero[i] else dp[i - 2] + dp[i - 1]
    if dp[i] > MOD:
        dp[i] %= MOD
print((dp[-1]))

+def full(shape, full_value): +    if isinstance(shape, tuple): +        NotImplementedError() +    else: +        return [full_value] * shape + + -import numpy as np - -to_zero = np.full((N + 1), False).tolist() +to_zero = full((N + 1), False) -dp = np.full((N + 1), -1).tolist() +dp = full((N + 1), -1)