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import sys
num_stamps = int(sys.stdin.readline()) stamps = {sys.stdin.readline().rstrip() for _ in range(num_stamps)} sys.stdout.write(str(len(stamps)))
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Set .add()
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import sys
num_stamps = int(sys.stdin.readline()) stamps = {sys.stdin.readline().rstrip() for _ in range(num_stamps)} sys.stdout.write(str(len(stamps)))