a,b=map(int,raw_input().strip().split())
i=j=0
c=""
if a==1:
    print "*"*b  
elif b==1:
    while j<a:
        print '*'
        j=j+1
else:
    print "*"*b   
    while i<a-2:
     c="*"+" "*(b-2)+"*"
     i=i+1 
     print c
    print "*"*b