Please help on 6.11-6.13

Write a program that reads a word and prints the word in reverse. For example, if the user provides the input "Harry", the program prints yrraH Write a program that reads a word and prints the number of vowels in the word. For this exercise, assume that a e i o u y are vowels. For example, if the user provides the input "Harry", the program prints 2 vowels. Write a program that reads a word and prints all substrings, sorted by length. For example, if the user provides the input" rum", the program prints r u m ru um run Write a program that prints all powers of 2 from 2^0 up to 2^20. Write a program that reads a number and prints all of its binary digits: Print the remainder number % 2, then replace the number with number/2. Keep going until the number is 0. For example, if the user provides the input 13, the output should be 1 0 1 1