Online Judge	Problem Set	Authors	Online Contests	User
Web Board Home Page F.A.Qs Statistical Charts	Problems Submit Problem Online Status Prob.ID:	Register Update your info Authors ranklist	Current Contest Past Contests Scheduled Contests Award Contest	User ID: Password:   Register

input:
1
ab

ababab

output:
<empty line>

Home Page   Go Back  To top

All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator