from itertools import zip_longest

print(("".join(["".join(a) for a in zip_longest(eval(input()),eval(input()),fillvalue="")])))
a,b=list(eval(input())),list(eval(input()))

l=len(a+b)

ans=""

for i in range(l):

  if i % 2 == 0:

    ans += a.pop(0)

  else:

    ans += b.pop(0)

print(ans)
from itertools import zip_longest

print(
    (
        "".join(
            [
                "".join(a)
                for a in zip_longest(eval(input()), eval(input()), fillvalue="")
            ]
        )
    )
)

a, b = list(eval(input())), list(eval(input()))
l = len(a + b)
ans = ""
for i in range(l):
    if i % 2 == 0:
        ans += a.pop(0)
    else:
        ans += b.pop(0)
print(ans)

-from itertools import zip_longest - -print( -    ( -        "".join( -            [ -                "".join(a) -                for a in zip_longest(eval(input()), eval(input()), fillvalue="") -            ] -        ) -    ) -) +a, b = list(eval(input())), list(eval(input())) +l = len(a + b) +ans = "" +for i in range(l): +    if i % 2 == 0: +        ans += a.pop(0) +    else: +        ans += b.pop(0) +print(ans)