
# 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:

board = [[False]*1000001]*1000001

while True:

    m = int(eval(input()))

    if m == 0: break

    star = list({tuple(map(int, input().split())) for i in range(m)})

    sx, sy = star[0]

    

    n = int(eval(input()))

    starlist = list({tuple(map(int, input().split())) for i in range(n)})

    for i in range(len(starlist)):

        board[starlist[i][0]][starlist[i][1]] = True

    for i in range(n):

        flag = True

        for j in range(len(star)-1):

            dx = starlist[i][0] + star[j+1][0] - sx

            dy = starlist[i][1] + star[j+1][1] - sy

            if dx < 0 or 1000000 < dx or dy < 0 or 1000000 < dy or board[dx][dy] == False:

                flag = False

                break



        if flag == True:

            print(("{} {}".format(starlist[i][0] - sx, starlist[i][1] -sy)))

            break

    

# optimized version of the same code:

while True:

    m = int(eval(input()))

    if m == 0: break

    star = list({tuple(map(int, input().split())) for i in range(m)})

    sx, sy = star[0]

    

    n = int(eval(input()))

    starset = {tuple(map(int, input().split())) for i in range(n)}

    for x, y in starset:

        flag = True

        for j in range(len(star)-1):

            dx = x + star[j+1][0] - sx

            dy = y + star[j+1][1] - sy

            if (dx, dy) not in starset:

                flag = False

                break



        if flag == True:

            print((x - sx, y - sy))

            break

    
board = [[False] * 1000001] * 1000001
while True:
    m = int(eval(input()))
    if m == 0:
        break
    star = list({tuple(map(int, input().split())) for i in range(m)})
    sx, sy = star[0]
    n = int(eval(input()))
    starlist = list({tuple(map(int, input().split())) for i in range(n)})
    for i in range(len(starlist)):
        board[starlist[i][0]][starlist[i][1]] = True
    for i in range(n):
        flag = True
        for j in range(len(star) - 1):
            dx = starlist[i][0] + star[j + 1][0] - sx
            dy = starlist[i][1] + star[j + 1][1] - sy
            if (
                dx < 0
                or 1000000 < dx
                or dy < 0
                or 1000000 < dy
                or board[dx][dy] == False
            ):
                flag = False
                break
        if flag == True:
            print(("{} {}".format(starlist[i][0] - sx, starlist[i][1] - sy)))
            break

while True:
    m = int(eval(input()))
    if m == 0:
        break
    star = list({tuple(map(int, input().split())) for i in range(m)})
    sx, sy = star[0]
    n = int(eval(input()))
    starset = {tuple(map(int, input().split())) for i in range(n)}
    for x, y in starset:
        flag = True
        for j in range(len(star) - 1):
            dx = x + star[j + 1][0] - sx
            dy = y + star[j + 1][1] - sy
            if (dx, dy) not in starset:
                flag = False
                break
        if flag == True:
            print((x - sx, y - sy))
            break

-board = [[False] * 1000001] * 1000001 -    starlist = list({tuple(map(int, input().split())) for i in range(n)}) -    for i in range(len(starlist)): -        board[starlist[i][0]][starlist[i][1]] = True -    for i in range(n): +    starset = {tuple(map(int, input().split())) for i in range(n)} +    for x, y in starset: -            dx = starlist[i][0] + star[j + 1][0] - sx -            dy = starlist[i][1] + star[j + 1][1] - sy -            if ( -                dx < 0 -                or 1000000 < dx -                or dy < 0 -                or 1000000 < dy -                or board[dx][dy] == False -            ): +            dx = x + star[j + 1][0] - sx +            dy = y + star[j + 1][1] - sy +            if (dx, dy) not in starset: -            print(("{} {}".format(starlist[i][0] - sx, starlist[i][1] - sy))) +            print((x - sx, y - sy))