Take a string of numbers and output the one which appears the most.

Just take any given string and output it in reverse, pretty easy, right?

Take a roman numeral(<1000 in value) and print its corresponding value in the decimal system of numbers.

Take an invalid JSON string and figure out where the errors are and make it valid.

Given two strings of equal length, figure out if one is a scramble of the other.

Take a list of integers and print it after sorting it in descending order.

Take a string of comma separated numbers and print out the sum.