switch(choice){
            case 'l':{
                vector<char>A;
                char letter;
                int count = 0;

                cout << "Enter letters or 1 to stop" << '\n';

                while(cin >> letter){
                    if(letter != '1'){
                        A.push_back(letter);
                        ++count;
                    }
                    else
                        break;
                }
                quicksort(A, 0, count);

                for(auto i : A)
                    cout << i << " ";
                cout << '\n';
                for(int i = 0; i <= A.size(); ++i)
                    cout << A[i] << " ";


            }
            case 'n':{
                vector<int>A;
                int number;
                int count = 0;

                cout << "Enter numbers or a to stop" << '\n';


                while(cin >> number){
                    if(number != 'a'){
                        A.push_back(number);
                        ++count;
                    }
                    else
                        break;
                }

                quicksort(A, 0, count-1);

                for(auto i : A)
                    cout << i << " ";
                for(int i = 0; i <= A.size(); ++i)
                    cout << A[i] << " ";

                break;
            }