Problem Description

Find the distance between the first and last occurrence of a given character in a string. Distance is the number of positions between them (exclusive).

Input Format

First line contains the string. Second line contains the character to find.

Output Format

Distance between first and last occurrence, or -1 if character appears less than twice.

Constraints

• 1 ≤ string length ≤ 1000

• Character is a single ASCII character

• Case-sensitive search

• Distance = last_index - first_index - 1

• Return -1 if character appears 0 or 1 times

Sample Input/Output

Explanation

In "programming", 'm' appears at indices 6 and 9. Distance = 9 - 6 - 1 = 2.