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from __future__ import print_function
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import sys
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m, s = map(int, sys.stdin.readline().split())
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prefs = [ map(int, line.split()) for line in sys.stdin ]
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inits = [ set() for x in xrange(m) ]
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answer = set()
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for j in xrange(s):
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for i in xrange(m): answer.add(prefs[i][j])
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all_ok = True
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for i in xrange(m):
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inits[i].add(prefs[i][j])
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if len(inits[i]) != len(answer): all_ok = False
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if all_ok: break
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print(len(answer)); print(" ".join(map(str, sorted(answer))))
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