# [Solved] You are given a positive integer num consisting only of digits 6 and 9. Return the maximum number you can get by changing at most one digit (6 becomes 9, and 9 becomes 6).

## Question

You are given a positive integer `num` consisting only of digits `6` and `9`.

Return the maximum number you can get by changing at most one digit (`6` becomes `9`, and `9` becomes `6`).

Example 1:

```Input: num = 9669
Output: 9969
Explanation:
Changing the first digit results in 6669.
Changing the second digit results in 9969.
Changing the third digit results in 9699.
Changing the fourth digit results in 9666.
The maximum number is 9969.
```

Example 2:

```Input: num = 9996
Output: 9999
Explanation: Changing the last digit 6 to 9 results in the maximum number.
```

Example 3:

```Input: num = 9999
Output: 9999
Explanation: It is better not to apply any change.
```

Constraints:

• `1 <= num <= 104`
• `num` consists of only `6` and `9` digits.

## Python Solution

```class Solution:
def maximum69Number(self, num):
return int(str(num).replace('6', '9', 1))``` ##### Abhishek Sharma

Started my Data Science journey in my 2nd year of college and since then continuously into it because of the magical powers of ML and continuously doing projects in almost every domain of AI like ML, DL, CV, NLP.

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