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S = input()
found_it= False
for i in range(len(S)-1):
j=S[i]
if j.isalnum() is True and S[i+1]==j:
found_it = True
print(j)
break
if found_it is False:
print(-1)
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Group(), Groups() & Groupdict()
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S = input() found_it= False for i in range(len(S)-1): j=S[i] if j.isalnum() is True and S[i+1]==j: found_it = True print(j) break if found_it is False: print(-1)