A challenge that was never discovered during the 2021 Constellations mission... now ungated :)
Attachment: app.py
looking at app.py it will remove first character from name parameter name = name[1:] and put it in regex
results = re.findall(r"[A-Z][a-z]*?" + name + r"[a-z]*?\n", users, setting)
in regex .* means everything and we can escape other conditions with use of or operator "|".
payload: A|.*|
flag{f0e659b45b507d8633065bbd2832c627}