import sys

def LS2(): return list(sys.stdin.readline().rstrip())  #空白なし





S = LS2()

ans = ''

for i in range(0,len(S),2):

    ans += S[i]



print(ans)

import sys

def S(): return sys.stdin.readline().rstrip()





S = S()

print((S[::2]))

import sys


def LS2():
    return list(sys.stdin.readline().rstrip())  # 空白なし


S = LS2()
ans = ""
for i in range(0, len(S), 2):
    ans += S[i]
print(ans)

import sys


def S():
    return sys.stdin.readline().rstrip()


S = S()
print((S[::2]))

-def LS2(): -    return list(sys.stdin.readline().rstrip())  # 空白なし +def S(): +    return sys.stdin.readline().rstrip() -S = LS2() -ans = "" -for i in range(0, len(S), 2): -    ans += S[i] -print(ans) +S = S() +print((S[::2]))