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- # coding: utf-8
- # Programacao 1, 2014.1 Pedro Paulo
- # Zerinho Ou Um Normal
- while True:
- entrada = raw_input().split()
- if entrada == ['-1']:
- break
- uns = 0
- zeros = 0
- for j in entrada:
- if j == '1':
- uns += 1
- elif j == '0':
- zeros += 1
- if zeros == 1:
- print entrada.index('0') + 1
- elif uns == 1:
- print entrada.index('1') + 1
- else: print "X"
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