Ví dụ

• input
  [CASE]
  bpefqqccphoftvkjbdh
  acjqdmijupmeeprxmys
  
  [CASE]
  whmhnssxdyzqkmhwpospqk
  xxraufwdjkjpssmexdvxzp
  
  [CASE]
  fgcrrrvgkqee
  yjavpcfuisgz
  
  [CASE]
  slkobsaryllduvydwrxdqhqrj
  bjummxxbuujabgikdfzoyvwez
  
  [CASE]
  wcsvdpkdzbajmezholmv
  hcsqduwakbhivcyylbkg
  
  [CASE]
  juzeixfdtlvbwhqnbbtqshpogsxneqc
  eaqgaloxckjxfckreqhfkxnmlwxfpha
  
  [CASE]
  odttnpqtbbmgdhtvm
  jyppecayiclrzubgn
  
  [CASE]
  
  output
  aaefamccphmeapkabah
  wamanasadaapkmhapdspqk
  agarpaaaiqea
  ajkmbsaauljaaaadafxdqaqaa
  acsqdpkaabaimcyalbka
  eaqealfaakjaacknbahfkanmgsxfeha
  jappeaatbblgaaaam
  sfagdacwamrjasbavapgamgaa
  kageakcicum