
# 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:

n, m, l = list(map(int, input().split()))



a = [0]*n

b = [0]*m

c = [[0 for col in range(l)] for row in range(n)]



for i in range(n):

    a[i] = list(map(int,input().split()))



for i in range(m):

    b[i] = list(map(int,input().split()))





for i in range(n):

    for j in range(l):

        for k in range(m):

            c[i][j] += a[i][k]*b[k][j]

    print((*c[i]))

# optimized version of the same code:

n, m, l = list(map(int, input().split()))



a = [0]*n

b = [0]*m

c = [[0 for col in range(l)] for row in range(n)]



for i in range(n):

    a[i] = list(map(int,input().split()))



for i in range(m):

    b[i] = list(map(int,input().split()))





for i in range(n):

    for j in range(l):

        c[i][j] = sum([a[i][k]*b[k][j] for k in range(m)])

#        for k in range(m):

#            c[i][j] += a[i][k]*b[k][j]

    print((*c[i]))
n, m, l = list(map(int, input().split()))
a = [0] * n
b = [0] * m
c = [[0 for col in range(l)] for row in range(n)]
for i in range(n):
    a[i] = list(map(int, input().split()))
for i in range(m):
    b[i] = list(map(int, input().split()))
for i in range(n):
    for j in range(l):
        for k in range(m):
            c[i][j] += a[i][k] * b[k][j]
    print((*c[i]))

n, m, l = list(map(int, input().split()))
a = [0] * n
b = [0] * m
c = [[0 for col in range(l)] for row in range(n)]
for i in range(n):
    a[i] = list(map(int, input().split()))
for i in range(m):
    b[i] = list(map(int, input().split()))
for i in range(n):
    for j in range(l):
        c[i][j] = sum([a[i][k] * b[k][j] for k in range(m)])
    #        for k in range(m):
    #            c[i][j] += a[i][k]*b[k][j]
    print((*c[i]))

-        for k in range(m): -            c[i][j] += a[i][k] * b[k][j] +        c[i][j] = sum([a[i][k] * b[k][j] for k in range(m)]) +    #        for k in range(m): +    #            c[i][j] += a[i][k]*b[k][j]