Memory limit: $256Mb$

Time limit: $1000$ ms

Input file: stdin

Output file: stdout

Task:

You are given a text made up of ASClI symbols.

You need to normalize the text: delete all symbols that are not latin letters, digits or a whitespace character, and decapitalize every letter $($make it lowercase$).$

Input:

You are given a text $s$ that can contain any ASCII symbols.

Output:

The normalized text.

$**$ Use only C$++**$