def b_find():
pattern = raw_input()
questions = doubt_all.keys()
regex = re.compile(".*(%s).*" % pattern)
search_result = [m.group(0) for l in questions for m in [regex.search(l)] if m]
s = search_result
global s
return search_result
def show_doubts_pair():
for doubt in doubt_all.keys():
print doubt,'\n', '\n'.join([i for i in doubt_all[doubt].keys()]), '\n'
def show_doubts():
for doubt in doubt_all.keys():
print doubt
