'''
After Drawing this calculations:
lvl     draw        fx
0       1           1 + (2*lvl)         0 = 1
1       3           1 + (2*lvl)         2 + 1 = 3
2       5           1 + (2*lvl)         4 + 1 = 5
3       CENTER      "CENTER"
4       5           max_draw - (((lvl-center) - 1) * 2 )
5       3           max_draw - (((lvl-center) - 1) * 2 )
6       1           max_draw - (((lvl-center) - 1) * 2 )

max_lvl = 7
widht = 21
center = (max_lvl-1)/2 = 3
max_draw = max_lvl - 2
'''

height, widht =  list(map(int, input().split()))

# Some calculations
middle_line = int((height-1)/2)
max_draw = height - 2 # I dont really know if its a rule xD
pattern = ".|."

# Drawing:
for lvl in range(height):
    # Before center:
    if lvl < middle_line:
        items = 1+(2 * lvl)
        print(f'{items*pattern}'.center(widht,"-"))

    elif lvl ==  middle_line:
        print("WELCOME".center(widht,"-"))

    elif lvl > middle_line:
        items = max_draw - (((lvl-middle_line) - 1) * 2 )
        print(f'{items*pattern}'.center(widht,"-"))