
# 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 numpy as np

h,w=map(int,input().split())

t=[list(input()) for _ in range(h)]

for i in range(h):

    t[i]=[(tij=="#")*1 for tij in t[i]]

t=np.array(t,dtype="i2")

rows=[]

columns=[]

for i in range(h):

    if np.sum(t[i])==0:

        rows+=[i]

for j in range(w):

    if np.sum(t[:,j])==0:

        columns+=[j]

t=np.delete(t,rows,0)

t=np.delete(t,columns,1)

for i in range(h-len(rows)):

    print(*["#" if tij else "." for tij in t[i]],sep="")


# optimized version of the same code:

h,w=map(int,input().split())

t=[list(input()) for _ in range(h)]

for i in range(h):

    t[i]=[(tij=="#")*1 for tij in t[i]]

rows=[]

columns=[]

for i,ti in enumerate(t):

    if sum(ti)==0:

        rows+=[i]

for j,tj in enumerate(zip(*t)):

    if sum(tj)==0:

        columns+=[j]

nt=[]

for i,ti in enumerate(t):

    if i in rows:continue

    nti=[]

    for j,tij in enumerate(ti):

        if j in columns:continue

        nti+=["#" if tij else "."]

    print(*nti,sep="")

import numpy as np

h, w = map(int, input().split())
t = [list(input()) for _ in range(h)]
for i in range(h):
    t[i] = [(tij == "#") * 1 for tij in t[i]]
t = np.array(t, dtype="i2")
rows = []
columns = []
for i in range(h):
    if np.sum(t[i]) == 0:
        rows += [i]
for j in range(w):
    if np.sum(t[:, j]) == 0:
        columns += [j]
t = np.delete(t, rows, 0)
t = np.delete(t, columns, 1)
for i in range(h - len(rows)):
    print(*["#" if tij else "." for tij in t[i]], sep="")

h, w = map(int, input().split())
t = [list(input()) for _ in range(h)]
for i in range(h):
    t[i] = [(tij == "#") * 1 for tij in t[i]]
rows = []
columns = []
for i, ti in enumerate(t):
    if sum(ti) == 0:
        rows += [i]
for j, tj in enumerate(zip(*t)):
    if sum(tj) == 0:
        columns += [j]
nt = []
for i, ti in enumerate(t):
    if i in rows:
        continue
    nti = []
    for j, tij in enumerate(ti):
        if j in columns:
            continue
        nti += ["#" if tij else "."]
    print(*nti, sep="")

-import numpy as np - -t = np.array(t, dtype="i2") -for i in range(h): -    if np.sum(t[i]) == 0: +for i, ti in enumerate(t): +    if sum(ti) == 0: -for j in range(w): -    if np.sum(t[:, j]) == 0: +for j, tj in enumerate(zip(*t)): +    if sum(tj) == 0: -t = np.delete(t, rows, 0) -t = np.delete(t, columns, 1) -for i in range(h - len(rows)): -    print(*["#" if tij else "." for tij in t[i]], sep="") +nt = [] +for i, ti in enumerate(t): +    if i in rows: +        continue +    nti = [] +    for j, tij in enumerate(ti): +        if j in columns: +            continue +        nti += ["#" if tij else "."] +    print(*nti, sep="")