



import numpy as np





s=input()

for i in range(len(s)):

    if(i%2==0):

        print(s[i],end="")

print()





import numpy as np





print((input()[::2]))

import numpy as np

s = input()
for i in range(len(s)):
    if i % 2 == 0:
        print(s[i], end="")
print()

import numpy as np

print((input()[::2]))

-s = input() -for i in range(len(s)): -    if i % 2 == 0: -        print(s[i], end="") -print() +print((input()[::2]))