Question $27$

Max. score: $100\mathrm{.}00$

Numbers and cards

You are given $10$ types of cards. Every card has a specific number written on it from $O$ to $9.$ There are $K$ cards for each number. You have a total

$13$

of ${10}^{**}K$ cards.

$14$

Select $N$ cards from the provided ${10}^{**}K$ cards and determine the number of different sets of $N$ cards that can be generated.

The first line contains two space$-$separated integers $N$ and $K.$

Output format

Print the answer representing the number of different sets of $N$ cards modulo $({10}^9+7).$

Constraints

$1N,K{10}^9$

$N10K$

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