n = int(input())

for i in range(n):
    if i == 0 or i == n - 1:
        for i in range(n):
            print("*", end="")
    for x in range(n):
        if (x == 0 or x == n -1) and (i != 0 and i != n -1):
            print("*", end="")
        else:
            print(" ", end="")
    
    
    print("")