Visitors to the Eötvös Loránd¹ University of Sciences in Budapest are greeted by a perpetual book with leaves of water.

Visitors to the Eötvös Loránd University of Sciences in Budapest are greeted by a perpetual book with leaves of water.

Assignment

A reference to a number of consecutive pages from a book is usually noted as m–n, with $$m \in \mathbb{N}_0$$ the number of the first page and $$n \in \mathbb{N}_0$$ the number of the last page (with $$m < n$$). A reference to a single page with number $$m$$ is simply noted as m (so we never write m–m).

If the numbers $$m$$ and $$n$$ have the same number of digits, the notation is often abbreviated by removing the longest common prefix in the digits of $$m$$ and $$n$$ from $$n$$. For example, the notation 1234–1247 can be abbreviated to 1234–47 by removing the longest common prefix 12 from 1247. We can therefore easily recognize that m–n is an abbreviation, given that in this case $$m > n$$.

Input

A reference to a number of consecutive pages from a book. This can either be a reference to a single page or a range of more than one page. In the latter case, both the long notation or the short notation can be used.

Output

The total number of pages in the given reference. When counting pages, both the first and the last page of the reference are taken into account.

Example

Input:

Output:

Example

Input:

99-103

Output:

Example

Input:

1234-1247

Output:

Example

Input:

1234-47

Output:

Assignment

Input

Output

Example

Example

Example

Example

Epilogue: stairs of knowledge