[Python] How to find the short list from a long list if the elements in the short one are all...

I have a nested list:

a=[[1,2,3],[0,1,2,3,4],[5,7,9],[5,6,7,8,9],[7,10],[10,7,2,1]]


Now, I want to delete [1,2,3] because it is included in [0,1,2,3,4]. And I need to keep [5,7,9] because although it is included in [5,6,7,8,9] but there are some numbers in between. Also, [7,10] should be kept too because these numbers are in the wrong order in [10,7,2,1]. So, the simplified list is:

a=[[0,1,2,3,4],[5,7,9],[5,6,7,8,9],[7,10],[10,7,2,1]]


So, I need to delete the short sub lists if they are included in the long ones without any changes. How can I do that?

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