
# 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 = eval(input())

print(('A' if not a.islower() else 'a'))


# optimized version of the same code:

print(('A' if input().isupper() else 'a'))

a = eval(input())
print(("A" if not a.islower() else "a"))

print(("A" if input().isupper() else "a"))

-a = eval(input()) -print(("A" if not a.islower() else "a")) +print(("A" if input().isupper() else "a"))