input_list  = list(map(int, input().split()))

center_design = math.floor(input_list[0] / 2)

def print_top_design():
    for loop_index in range(center_design):
        i = 2 * loop_index + 1
        mid_design = '.|.'
        design = (mid_design*i).center(input_list[1], '-')  
        print(design)

def print_bot_design():
    for loop_index in range(center_design - 1, -1, -1):
        i = 2 * loop_index + 1
        mid_design = '.|.'
        design = (mid_design*i).center(input_list[1], '-')  
        print(design)