1) Reverse a number: Given an integer input, output its digits in reverse order. For example, input: 9966, output: 6699. 2) Word count in a string: Given a string, return the count of each unique word. For example, input: 'The lovely lady is looking lovely as all lady look lovely' output: The: 1, lovely: 3, lady: 2, is: 1, looking: 1, as: 1, all: 1, look: 1. 3) Swap two numbers without using a temporary variable: Given two numbers, swap their values without using a third variable. For example, input: a = 10, b = 20. Output: a = 20, b = 10.