n = int(input())

for i in range(1,n+1) :
    if i == 1 or i == n :
        print("*" * n)
    elif i == 2 :
        print("*" * i + " " * (n-3) + "*" )
    elif i == n-1 :
        print("*"  + " " * (n-3) + "*" * 2)   
    else :
        print("*" + " " * (i-2) + "*" + " " * (n-i-1) + "*" )