495. Maximum 69 Number
EasyGreedy
The number consists only of digits 6 and 9. Change at most one digit to get the largest possible number and print it.
Input format
One integer
Output format
The maximum number.
Example 1
Input
9669
Output
9969
Example 2
Input
9996
Output
9999
Constraints
1 ≤ n ≤ 10⁴
Read input from standard input and print the answer to standard output. Your code is judged against 4 test cases, most of them hidden.
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