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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*