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## 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*
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