
# 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:

w = eval(input())

y = list(set(w))



for i in range(len(y)):

    if w.count(y[i]) % 2 != 0:

        print('No')

        exit(0)



print('Yes')

# optimized version of the same code:

w = list(eval(input()))

x = list(set(w))

for i in x:

    y = w.count(i)

    if y % 2 != 0:

        print('No')

        exit(0)

print('Yes')
w = eval(input())
y = list(set(w))
for i in range(len(y)):
    if w.count(y[i]) % 2 != 0:
        print("No")
        exit(0)
print("Yes")

w = list(eval(input()))
x = list(set(w))
for i in x:
    y = w.count(i)
    if y % 2 != 0:
        print("No")
        exit(0)
print("Yes")

-w = eval(input()) -y = list(set(w)) -for i in range(len(y)): -    if w.count(y[i]) % 2 != 0: +w = list(eval(input())) +x = list(set(w)) +for i in x: +    y = w.count(i) +    if y % 2 != 0: