n=int(input())
X=[]
for i in range(n):
    X.append(["."]*n)

for i in range(n):
    for j in range(n):
        if i+j==n-2:
            X[i][j]="#"
        if i+j==n-1 and i!=0 and j!=0:
            X[i][j]="#"

for I in X:
    print("".join(I))