Задачи

1.Extract words from a sentence.

2.Extract numbers from a sentence.

3.Extract numbers from a mixed sentence.

Input: FMI 1234 fmi 9876 fn101010
Output: 1234 9876 101010

4.Write a program that extracts from a given sequence of words all elements that appear in it an odd number of times (case-insensitive).
- Words are given in a single line, space separated.
- Print the result elements in lowercase, in their order of appearance.

Input: Java C# PHP PHP JAVA C java
Output: java, c#, c

Input: a a A SQL xx a xx a A a XX c
Output: a, sql, xx, c

5.Read a text, extract its words (separated by spaces) find all short words (less than 5 characters). Print them alphabetically, in lowercase, separate by a single comma and a single space. - Use case-insensitive matching.
- Remove duplicated words.

Input: In FMI you can study C++ java C# PHP and JavaScript. C++ is used
Output: and, c#, c++, can, fmi, in, is, java, php, used, you