How do I write a code for this in Python?

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Rahul is facing a unique problem, which he doesn't know how to solve. The problem asks him to build the smallest possible number by applying inversion on any digit of the number any number of times.
Inversion of a digit is defined as that digit being replaced by 9 minus that digit. Meaning that inversion of 9 will be 9 - 9 = 0 and inversion of 1 will be 9 - 1 = 8 and so on.

The final output should not have any leading zeroes.

Input Format:
The only line of the input contains an integer N

Output Format:
Print only one single integer on a line as described above.

Constraints:
1 <= N <= 10^18

Examples:
Input:
87
Output:
12

Explanation:

9-8 = 1

and 9 -7 = 2

if we see carefully, 12 is the smallest possible number we can get.

What I have tried:

Python

x=input()
1 <= int(x) <= 10^18
for i in range(1,len(x)):
    x[i]=int(x[i])
    if x[i]>5:
        x[i]=9-x[i]
if x[0]==9:
    x[0]==9
elif x[0]>5:
    x[0]=9-x[i]
else:
    x[0]=x[0]
print(x)

Posted 18-Nov-20 5:13am

Member 14987645

Updated 22-Oct-22 0:23am

v4

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[no name] 18-Nov-20 12:18pm

You need to show your "input", and what you got as "output", and what you "expected". We don't do "desk checking" for nothing.

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Richard MacCutchan · Accepted Answer · 2020-11-18T06:18:00

Here is the basic code for inverting a number:

Python

answer = ''
x=input()
for i in range(len(x)):
    digit = 9 - int(x[i])
    answer = answer + str(digit)
print(answer)

You may need to modify that to take account of any other rules you are supposed to follow. By the way the line

Python

1 <= int(x) <= 10^18

does not actually do anything. It is a good idea to test your code as you write it, and try and fix any errors immediately as you see them.

How do I write a code for this in Python?

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