s=list(map(int,input().split()))
a=s[0]
b=s[1]
if a>1:
 for k in range(1,b+1):
    print("*",end="")
 print()
 for k  in range(2,a):
    for  p in range(1,b+1):
        if p==1 or p==b:
            print("*",end="")
        else:
            print(" ",end="")
    print()
 for k in range(1,b+1):
    print("*",end="")
else:
    for k in range(1,b+1):
     print("*",end="")