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Hunan Normal University
College of Information Science and Engineering
DRM Messages
Time Limit: 1000ms, Special Time Limit:2500ms, Memory Limit:32768KB
Total submit users: 8, Accepted users: 8
Problem 11805 : No special judgement
Problem description
  本次比赛题目,请下载(题目为 PDF格式)


Input
  

Output
  

Sample Input
EWPGAJRB
Sample Output
ABCD
Problem Source
  ECNA 2017

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