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