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Contest: Task: Related: TaskB

Score : $300$ points

Problem Statement

Given is a string $S$. Let $T$ be the concatenation of $K$ copies of $S$. We can repeatedly perform the following operation: choose a character in $T$ and replace it with a different character. Find the minimum number of operations required to satisfy the following condition: any two adjacent characters in $T$ are different.

Constraints

  • $1 \leq |S| \leq 100$
  • $S$ consists of lowercase English letters.
  • $1 \leq K \leq 10^9$
  • $K$ is an integer.

Input

Input is given from Standard Input in the following format:

$S$
$K$

Output

Print the minimum number of operations required.

Sample Input 1

issii
2

Sample Output 1

4

$T$ is issiiissii. For example, we can rewrite it into ispiqisyhi, and now any two adjacent characters are different.

Sample Input 2

qq
81

Sample Output 2

81

Sample Input 3

cooooooooonteeeeeeeeeest
999993333

Sample Output 3

8999939997