# a = [1,2,3,4,5,6]
# a. append(7)
# print(a)

# b = [1,2,4,5]
# b.insert(2,3)
# print(b)

# c = [3,1,2,3]
# c.remove(3)
# print(c)

# d = [6,3,1,2,4,5,]
# d.sort()
# print(d)

#print(len(d)) #길이

#  e = "코딩" + "파이썬"

# print(e)

# f = ["Hi"] * 3
# print(f)

# i = 0
# N = int(input())
# for i in range(1,10):
#     print(N, "*" ,i, "=" ,N*i)
# i+=1

# a = []
# for i in range(0,10):
#     a.append(int(input()))
# for i in range(9 , -1 , -1):
#     print(a[i], end=" ")

a = input()
for i in range(len(a)):
    if i % 2 ==0:
        print(a[i], end =" ")