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You can use the count function.
if conf.count(a) > 1:
print a, "-conflict"
The above method is similar to what you have tried. But this is inefficient when the list is large. So, use collections.Counter.
from collections import Counter
occurences = Counter(conf)
for a in list:
if occurences[a] > 1:
print a, "- conflict"
else:
print a
Source:stackexchange.com