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D - Three Days Ago

Score : $400$ points

Problem Statement

The string 20230322 can be rearranged into 02320232, which is a repetition of 0232 twice.
Similarly, a string consisting of digits is said to be happy when it can be rearranged into (or already is) a repetition of some string twice.
You are given a string $S$ consisting of digits. Find the number of pairs of integers $(l,r)$ satisfying all of the following conditions.

• $1 \le l \le r \le |S|$. ($|S|$ is the length of $S$.)
• The (contiguous) substring formed of the $l$-th through $r$-th characters of $S$ is happy.

Constraints

• $S$ is a string consisting of digits whose length is between $1$ and $5 \times 10^5$, inclusive.

Input

The input is given from Standard Input in the following format:

$S$

Output

Print an integer representing the answer.

20230322

4

We have $S=$ 20230322.

Here are the four pairs of integers $(l,r)$ that satisfy the condition: $(1,6)$, $(1,8)$, $(2,7)$, and $(7,8)$.

0112223333444445555556666666777777778888888889999999999

185

$S$ may begin with 0.

3141592653589793238462643383279502884197169399375105820974944

9