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Write a program that read string S from the keyboard; the program should have a function that takes the string S; the function stores all unique letters in the string S in list Land returns the list L. The program should print: the string S the string S with all letters capitalized. the list L returns by the function. the list L returns by the function in reverse order. Sample output for S = ToBeOrNotToBe" Enter a string: ToBeOrNotToBe the string: ToBeOrNotToBe the strting capitalized: TOBEORNOTTOBE the list: ['T, 'O, 'B' 'e, ' Or, 'N, 't'] the list reversed: ['t 'N' , 'r 'O, 'e' , 'B' , 'o' , 'T']