
# 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=input().split()

h,w=int(h),int(w)

x3=[]

for i in range(h):

    x1=input()

    if x1 !=  w*".":

        x3.append(list(x1))



x3=np.array(x3).T.tolist()

x4=[]

for i in range(w):

    if x3[i] != ["." for i in range(len(x3[i]))]:

        x4.append(x3[i])



x4=np.array(x4).T.tolist()

for i in range(len(x4)):

    for j in range(len(x4[0])):

        print(x4[i][j],end="")

    print()


# optimized version of the same code:

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

a=[]

for i in range(h):

    k=eval(input())

    if k!="."*w:

        a.append(k)

l=len(a)

#print(a)

ans=[[] for i in range(l)]

for i in range(w):

    for j in range(l):

        if a[j][i]=="#":

            for k in range(l):

                ans[k].append(a[k][i])

            break

for i in range(l):

    print(("".join(ans[i])))
import numpy as np

h, w = input().split()
h, w = int(h), int(w)
x3 = []
for i in range(h):
    x1 = input()
    if x1 != w * ".":
        x3.append(list(x1))
x3 = np.array(x3).T.tolist()
x4 = []
for i in range(w):
    if x3[i] != ["." for i in range(len(x3[i]))]:
        x4.append(x3[i])
x4 = np.array(x4).T.tolist()
for i in range(len(x4)):
    for j in range(len(x4[0])):
        print(x4[i][j], end="")
    print()

h, w = list(map(int, input().split()))
a = []
for i in range(h):
    k = eval(input())
    if k != "." * w:
        a.append(k)
l = len(a)
# print(a)
ans = [[] for i in range(l)]
for i in range(w):
    for j in range(l):
        if a[j][i] == "#":
            for k in range(l):
                ans[k].append(a[k][i])
            break
for i in range(l):
    print(("".join(ans[i])))

-import numpy as np - -h, w = input().split() -h, w = int(h), int(w) -x3 = [] +h, w = list(map(int, input().split())) +a = [] -    x1 = input() -    if x1 != w * ".": -        x3.append(list(x1)) -x3 = np.array(x3).T.tolist() -x4 = [] +    k = eval(input()) +    if k != "." * w: +        a.append(k) +l = len(a) +# print(a) +ans = [[] for i in range(l)] -    if x3[i] != ["." for i in range(len(x3[i]))]: -        x4.append(x3[i]) -x4 = np.array(x4).T.tolist() -for i in range(len(x4)): -    for j in range(len(x4[0])): -        print(x4[i][j], end="") -    print() +    for j in range(l): +        if a[j][i] == "#": +            for k in range(l): +                ans[k].append(a[k][i]) +            break +for i in range(l): +    print(("".join(ans[i])))