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S = input()
X = re.findall(r'[A-Za-z0-9]', S)
alphanumeric = ''.join(X)
groups = [char for char, group in groupby(alphanumeric) if len(list(group))>1]
if len(groups)>0:
print(groups[0])
else:
print('-1')
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Group(), Groups() & Groupdict()
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from itertools import groupby import re
S = input() X = re.findall(r'[A-Za-z0-9]', S) alphanumeric = ''.join(X) groups = [char for char, group in groupby(alphanumeric) if len(list(group))>1] if len(groups)>0: print(groups[0]) else: print('-1')