Test Case for Question #4 in DWITE 2009-2010 High School Round 1

Contest: DWITE 2009-2010 High School Round 1
Question: #4
Input File: DATA4.txt
Output File: OUT4.txt

Input

A

AAZ

ABABQ

ABCDEAB

GAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Output

A

Z

Q

C

G

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