Babu Bhai is a student of AUST. He has some favorite numbers. His favorite numbers are those number that has only one distinct digit. Example: 7, 88, 222, 9999, etc.
123, 122, 33344 are not his favorite numbers.
Now, given a positive integer $N$, you have to find a positive favorite number for Babu Bhai not greater that $N$.
The input contains a single integer $N$ ($1 \le N \le 1000$).
Print Babu Bhai's favorite number.
If there are multiple possible solutions print any of them. It is guaranteed that for the given $N$ a solution always exists.
| Input | Output |
|---|---|
100 | 99 |
88, 77, 66... are also acceptable. | |
| Input | Output |
|---|---|
99 | 99 |