a=int(input())

def edge(n,x,y):
    print(x,end="")
    for i in range(2,n):
        print(y,end="")
    print(x)

for i in range(1,a+1):
    if i == 1 or i == a:
        edge(a,"*","*")
    else:
        edge(a,"*"," ")