test 2 failed:
input:
7
VOTB PVFP
TR V
QIWZ BZI
FCEIESV LK
AAKT S
YEGQO ILOS
PBG XWFJO

expected:BOTV
TR
---
FCEIESV
AAKT
EYGQO
PBG
got:OVTB
TR
---
FCEIESV
AAKT
EYGQO
PBG