Rhezo got a string S, a character C and an integer P as a birthday gift from his best friend JK.

He got curious about the gift and started analysing it. He found out that the maximum frequency of character C over all the P length substrings of S is equal to some integer Z.

He doesn't know programming, so asks you to find the largest position, where, if we insert some character after that position, the maximum frequency of C over all the P length substrings becomes \(Z + 1\). If there is no such position, output 1.

If the answer is the position before the first character, output 0.

Input:

First line of the input contains a string S.
Second line of the input contains the character C.
Next and the last line contains a single integer P.

Output:

Print an answer in a separate line.

Constraints:

• \(1 \le |S| \le 10^3\)
• \(1 \le P \le |S|\)
• S consists of lowercase alphabetic characters
• C is any lowercase alphabetic character