Doubt in solving leetcode

#1

I cannot understand how the output is coming .Please help me in that.

#2

Input: s = "owoztneoer
if you rearrange this string
then you get the strings which are english representation of digits and you have to print those digits

for this input after rearranging we get
one zero two
so output is
012 (increasing order as mention in question)

#3

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