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Ex - Taboo

Score : $600$ points

Problem Statement

You are given a string $S$. Takahashi may perform the following operation $0$ or more times:

• Choose an integer $i$ such that $1 \leq i \leq |S|$ and change the $i$-th character of $S$ to *.

Takahashi's objective is to make $S$ not contain any of $N$ strings $T_1,T_2,\ldots,T_N$ as a substring.
Find the minimum number of operations required to achieve the objective.

Constraints

• $1 \leq |S| \leq 5 \times 10^5$
• $1 \leq N$
• $N$ is an integer.
• $1 \leq |T_i|$
• $\sum{|T_i|} \leq 5 \times 10^5$
• $T_i \neq T_j$ if $i \neq j$.
• $S$ and $T_i$ are strings consisting of lowercase English letters.

Input

Input is given from Standard Input in the following format:

$S$

$N$

$T_1$

$T_2$

$\vdots$

$T_N$

Output

Print the answer.

abcdefghijklmn
3
abcd
ijk
ghi

2

If he performs the operation twice by choosing $1$ and $9$ for $i$, $S$ becomes *bcdefgh*jklmn; now it does not contain abcd, ijk, or ghi as a substring.

atcoderbeginnercontest
1
abc

0

No operation is needed.

aaaaaaaaa
2
aa
xyz

4