
# 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:

import sys

e=[list(map(int,e.split()))for e in sys.stdin]

n=e[0][0]+1

for c in e[1:n]:

 t=''

 for l in zip(*e[n:]):t+=f'{sum(s*t for s,t in zip(c,l))} '

 print((t[:-1]))


# optimized version of the same code:

import sys

e=[list(map(int,e.split()))for e in sys.stdin]

n=e[0][0]+1

t=''

for c in e[1:n]:

 for l in zip(*e[n:]):t+=f'{sum(s*t for s,t in zip(c,l))} '

 t=t[:-1]+'\n'

print((t[:-1]))

import sys

e = [list(map(int, e.split())) for e in sys.stdin]
n = e[0][0] + 1
for c in e[1:n]:
    t = ""
    for l in zip(*e[n:]):
        t += f"{sum(s*t for s,t in zip(c,l))} "
    print((t[:-1]))

import sys

e = [list(map(int, e.split())) for e in sys.stdin]
n = e[0][0] + 1
t = ""
for c in e[1:n]:
    for l in zip(*e[n:]):
        t += f"{sum(s*t for s,t in zip(c,l))} "
    t = t[:-1] + "\n"
print((t[:-1]))

+t = "" -    t = "" -    print((t[:-1])) +    t = t[:-1] + "\n" +print((t[:-1]))