#!/usr/bin/env python

def top(n,w):
    return ["  "*w for _ in xrange(1,w)]+["__"*w] if n == 0 else\
    ["%s%s%s"%(" "*(len(t)//2),t," "*(len(t)//2)) for t in top(n-1,w)]+\
    ["%s%s"%m for m in zip(left(n-1,w),right(n-1,w))]

def left(n,w):
    return ["%s/%s"%(" "*i," "*j) for (i,j) in zip(xrange(w-1,-1,-1),xrange(w,w*2))] if n==0 else\
    ["%s%s%s"%(" "*(len(t)//2),t," "*(len(t)//2)) for t in right(n-1,w)]+\
    ["%s%s"%m for m in zip(top(n-1,w),left(n-1,w))]

def right(n,w):
    return ["%s\\%s"%(" "*i," "*j) for (j,i) in zip(xrange(w-1,-1,-1),xrange(w,w*2))] if n==0 else\
    ["%s%s%s"%(" "*(len(t)//2),t," "*(len(t)//2)) for t in left(n-1,w)]+\
    ["%s%s"%m for m in zip(right(n-1,w),top(n-1,w))]

def curve(n=0,w=1):
    return top(n+1,w)

import sys
print "\n".join(x.rstrip() for x in curve(*[int(x) for x in sys.argv[1:]]))