import sys
readline = sys.stdin.readline

# T = int(readline())
# for _ in range(T):
#     ans = solve()
#     print(ans)

# n = int(readline())
# a = [int(i) for i in readline().split()]
# ab = [[int(i) for i in readline().split()] for _ in range()]
# S = readline().strip()
# b = [readline().strip() for _ in range()]


n = int(readline())

for i in range(n):
    r = ["."]*n
    r[n-i-1] = "#"
    if n-i-2 >= 0:
        r[n-i-2] = "#"
    print("".join(r))