#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys

n = int(sys.argv[1])
ch = sys.argv[2]

if n > 0:
    s = 'grep ^' + n * '.' + '$ psp.dic '
else:
    s = 'cat psp.dic '
    
s2 = 'cat *.d '

for c in ch:
    s += '| grep ' + c + ' '
    s2 += '| grep ' + c + ' '

print '(' + s + '; ' + s2 + ' )'