n = input("N:")
def putra_petir(arg):
    a = ["0","1"]
    l = []
    for i in range(int(arg)):
        a.reverse()
        l.append(a[-1])
        print("_"*(arg-i) + a[-1])
        if i == arg-1:
            print("".join(l))
    for i in range(arg):
        a.reverse()
        print("_"*((arg-1)-i) + a[-1])

print(putra_petir(int(n)))