Arange is a sequence of characters in the form [character-character], such as [k-n] or [d-g]. write a program to check if a string contains a range and if so, replace them with the characters contained in the range. for example, the program should replace [k-n] with klmn. assume the input contains either one range or none. also assume that the range will be in the valid form [character-character] if the input contains one.