uva10789測資B

Input:

20
ABCCAABBBBDDDDDABCDFFFF
BbbbbBBB
BDBDBADDBDABDBDBADDBDAEEEEE
FBDBEEEDBADDBDAEEF
AABB0dfalfj03fal3jlajflf2abba
1022AABBCDDDBCACADBDDB
1282AB3921299972
DX9SLBABDAsdfkasdfksadfjlasdkfHHSDJBDDXKSw23lsklfksjf00923302303928398943kajfl02ja0dfalfj03fal3jlajflf23alsdf03lafkjljssnsfjlafjla0wlakjflsafjalkflagaldfsda
ADCHSGGDSHH3KJLXKSJADCBDDKJLXKSJKDSLBABDBDEFHSGDKSKDSLBABDBDEFHSDJBDD238834HSGDKS3782327absassasAKSJKBBBBDDDDDDsdfsdfs992333BSGDKSHSGGDSHHHSDJ23423SLBDDXKSJKDSLB
ADCKJLXKSJKDSLBKDSLfs
ADCKJLXKSJKDSDBDEFHSGGDSHHHSfkasBBBBDDDDDdfksadfjlDJBDDXKSJKDSLBGDKSHS
ADCKJDEFHJBDkflsadkf0933290420340928039245345435034953095ksf09345lkf0394rkfms0fsdaKAJFLKAJFDKJALFLAJFL
KGKFLGKDJGLKAFJSFGLSFGLSBBBBDDDDDGLSJFLGKJDSFGSKDLGJLSKJGLKRSKJKSLJGSLKFJGLBEEBADCKJLXKSJKDSLBKLXKSJKDBADD233DABDBDSLBABDABDBDEFHSGDKSHSGGDSHHHSDJBDDXKBDDSLBKDSLBABfs99SJKDSLB
adkf0933290420340928039245345435034953095kBBBBDDDDDsf09345lkf0394rkfms093fm094lmflskflkajdfjaelf309rfmlakjflkafjlkajKAJLFKJALFDJALFJLWSFDLKAJDFLAWJFLAJ3KLALKF
EFHSGGDSHHHSfkasdfksadfjlDJBDDXKSJKDSLBGDKS933290420HSfkasdfksadfjl
ADCKJDEFHJBDkflsadkf0933290420340928039245345435034953095ksf09345lkf0394rkfms093fm094lmflsms093fm094lmflskflkaj
dfjaelf309rfmlakjflkafjlkajKAJLFKJALFDJALFJLWSFDLKAJDFLAWJFLAJ3KLALKFDFL3jlajflf23alsdf03lafkjljssnsfjlafjla0wlakjflsafjalkfla93fm094
lmflskflkajdfjaelf309rfmlakjflkafjlkajKAJLFKJALFDJALFJLWSFDLKAJDFLAWJFLAJ3KLALKFDFL3jlajflf23alsdf03lafkjljssnsf
jlafjla0wjflkafjlkajKAJLFKJALFDJALFJLWSFDLKAJDFLAWJFLAJ3KLALKFDFL3jlajflf23alsdf03lafkjljslakjflsafjalkflagald
LXKSJKDS928039LBKLXKSJKDBlsdf03lafkjljssnsfjlaADD233DABDBD3290420340kafjlkajKAJLFKJALFDJALFJLWSFDLKAJDFLAWJFLAJ3KLALKFDFL3jlajflf23alsdf03lafk928039245345SLBABDABDBDE

Output:

Case 1: C
Case 2: empty
Case 3: E
Case 4: ADEF
Case 5: 03ABabfj
Case 6: 2BC
Case 7: 12
Case 8: 389ABDHSXjw
Case 9: 4789ACEFGKXadfs
Case 10: DJLS
Case 11: BGHLXadfks
Case 12: AFadkl
Case 13: 39AEHLSX
Case 14: 39AFJKWdjrs
Case 15: 0239BGHJKSjl
Case 16: 0DJakl
Case 17: 9AJKWadms
Case 18: 03AJKWdms
Case 19: 0AJKWdjks
Case 20: 02589ASWXadjs