C++ ZyLab 4.27: Merge and Sort.

We are allowed to only use loops/branches and the simple operations, not any vectors. Read two strings that contain only alphabet ('a' through 'z' and 'A' through 'Z'). Merge them based on the ASCII order of the alphabet. Remove all of the duplicated letters. See the example session below.

Read "binarytriangle" and "ANSIStandard" -> "AINSabdegilnrty" Read "RabitRunNING" and "TurTLeSLeepiNG" -> "GILNRSTabeinprtu" Bye... 

This is easily done by concatenating the two strings into one and finding the smallest letter and adding it to a new string until you consume all the letters in the concatenated string. No addition should be made if the letter is already added, i.e., if the letter at the tail of the new string has the same letter found as the smallest at the current round of iteration.

Assimilate the above example. You need the exact same format for grading. The input must be formed like below used for this example. You should not include non-alphabet letter; you should send two strings "quit" and "quit" to terminate program.

binarytriangle ANSIStandard RabitRunNING TurTLeSLeepiNG quit quit 

Please keep in mind, this needs to be solved using C++.