The edit distance between two strings is the minimum number of operations required to transform one string into the other.

The allowed operations are:

• Add one character to the string.
• Remove one character from the string.
• Replace one character in the string.

For example, the edit distance between LOVE and MOVIE is 2, because you can first replace L with M, and then add I.

Your task is to calculate the edit distance between two strings.

Input

• The first input line has a string that contains ~n~ characters between A–Z.

The second input line has a string that contains ~m~ characters between A–Z.

Output

• Print one integer: the edit distance between the strings.

Constraints

• ~1 \le n,m \le 5000~

Example Input

LOVE
MOVIE

Example Output

2