s=list(map(int,input().split()))
n=s[0]
m=s[1]
for i in range(0, n):
    for j in range(0, m):
        if i != 0 and i != n - 1:
            if j == 0 or j == m - 1:
                print("*",end="")
            else:
                print(" ",end="")
        else:
            print("*",end="")
        j += 1
    i += 1
    print()