[Python] How to merge 2 lists and sort them based on index?

I have the following dataframe:

idx​

val1​

val2​

0​

15​

12​

1​

14​

38​

2​

11​

88​

3​

95​

21​

4​

19​

98​

5​

12​

48​

6​

35​

38​

7​

25​

39​

8​

65​

28​

I created two lists based on index say.

list1 = [0, 3, 6]
list2 = [5, 8]


I tried to write a code wherein index values from list1 takes val1 data and list2 takes val2 data and same is sorted on index.

My output list should be

output = [15, 95, 48, 35, 28]

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