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