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C - chokudai

Score : $300$ points

Problem Statement

You are given a string $S$.
How many ways are there to choose and underline eight of its characters so that those characters read c, h, o, k, u, d, a, i from left to right?
Since the count can be enormous, print it modulo $(10^9 + 7)$.

Constraints

• $8 \leq |S| \leq 10^5$
• $S$ consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

$S$

Output

Print the number of ways modulo $(10^9 + 7)$.

chchokudai

3

We have three valid ways:

chchokudai
chchokudai
chchokudai

while the following is invalid:

chchokudai

atcoderrr

0

The answer may be $0$.

chokudaichokudaichokudai

45