# your code goes here
import re
i=input()
s=i.find('AUG')
t=min(x for x in sorted(map(i.find,re.findall('UA[AG]|UGA',i)))if x>=s)
if s>=0:print re.findall('...',i[s:t])
else:print []
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmltcG9ydCByZQppPWlucHV0KCkKcz1pLmZpbmQoJ0FVRycpCnQ9bWluKHggZm9yIHggaW4gc29ydGVkKG1hcChpLmZpbmQscmUuZmluZGFsbCgnVUFbQUddfFVHQScsaSkpKWlmIHg+PXMpCmlmIHM+PTA6cHJpbnQgcmUuZmluZGFsbCgnLi4uJyxpW3M6dF0pCmVsc2U6cHJpbnQgW10=