e=int(input())

sqr=[[0 for x in range(e)] for x in range(e)] 

for i in range(e):
    for j in range(e):
        if i == 0  or i == e-1  or i == j or j == 0 or j == e-1:
            sqr[i][j] = "*"
        else:
            sqr[i][j] = " "

for edges in sqr:
    for rows in edges:
        print(rows,end=" ")
    print()