
# 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:

from string import ascii_lowercase as lower

print((lower[lower.find(eval(input()))+1]))

# optimized version of the same code:

print((chr(ord(eval(input()))+1)))
from string import ascii_lowercase as lower

print((lower[lower.find(eval(input())) + 1]))

print((chr(ord(eval(input())) + 1)))

-from string import ascii_lowercase as lower - -print((lower[lower.find(eval(input())) + 1])) +print((chr(ord(eval(input())) + 1)))