A10150 | Cutting the Line

You are given a non-empty line $s$ and an integer $k$ . The following operation is performed with this line exactly once:

- A line is split into at most $k$ non-empty substrings, i.e. string $s$ is represented as a concatenation of a set of strings $s=t_{1}+t_{2}+...+t_{m}$ , $1<=m<=k$ .
- Some of strings $t_{i}$ are replaced by strings $t_{i}^{r}$ , that is, their record from right to left.
- The lines are concatenated back in the same order, we get string $s'=t'_{1}t'_{2}...\ t'_{m}$ , where $t'_{i}$ equals $t_{i}$ or $t_{i}^{r}$ .

Your task is to determine the lexicographically smallest string that could be the result of applying the given operation to the string $s$ .

The first line of the input contains string $s$ ( $1<=|s|<=5000000$ ), consisting of lowercase English letters. The second line contains integer $k$ ( $1<=k<=|s|$ ) — the maximum number of parts in the partition.

In the single line print the lexicographically minimum string $s'$ which can be obtained as a result of performing the described operation.