Not able to understand whats asked in the question

#1

not able to understand whats asked in the question.

#2

hello @dipeshpandey2001

you are given a number u need to obtain minimum number from it.

the operation that u can apply on any of its digit is .
if d is the digit of given number then u can replace it with 9-d.

also the newly formed number must not have leading 0.

#3

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