DWITE Contest

Test Case for Question #4 in DWITE 2009-2010 High School Round 5

Contest: DWITE 2009-2010 High School Round 5
Question: #4
Input File: DATA4.txt
Output File: OUT4.txt


Input

x.x.
xxxx
x.xx
xxxx
x.xxx
xxxxx
x.xx.
xxxxx
x.xx.x
xxxxxx




Output

AA
AB
CB
CA
CC