String Manipulation Exercise

[Mikey015]

Construct a console application using C++. The application should accept a single argument, a string. The application should then output an alphabetized list of all the letters used in the string ignoring duplicate letters. All letters should be output as capitals. The application should then prompt for another string and do the same thing with the newly entered string. It should continue to prompt until an empty string is entered, at which point it should exit.

Any suggestions or pointers? I am new to this and trying this exercise.

Thank you!

[tfityo]

To store letters use set<char>.
All letters will be sorted and duplicates will be removed automatically.

http://www.cplusplus.com/reference/stl/set/