
# 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())

for l in w:

	if w.count(l) % 2 == 1:

		print("No")

		break

else:

	print("Yes")

# optimized version of the same code:

from collections import Counter

s = eval(input())

c = list(Counter(s).values())

for n in c:

	if n & 1 == 1:

		print("No")

		break

else:

	print("Yes")



w = eval(input())
for l in w:
    if w.count(l) % 2 == 1:
        print("No")
        break
else:
    print("Yes")

from collections import Counter

s = eval(input())
c = list(Counter(s).values())
for n in c:
    if n & 1 == 1:
        print("No")
        break
else:
    print("Yes")

-w = eval(input()) -for l in w: -    if w.count(l) % 2 == 1: +from collections import Counter + +s = eval(input()) +c = list(Counter(s).values()) +for n in c: +    if n & 1 == 1: