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  1. a = [[3,2,1],[4,3,2],[5,4,3]]
  2. a = [sorted(lista) for lista in a]
  3. print(a)
Success #stdin #stdout 0.04s 9220KB
stdin
Standard input is empty
stdout
[[1, 2, 3], [2, 3, 4], [3, 4, 5]]