function solve(arr) {


        let arr2 = [];


        for (let i = 0; i < arr.length; i++) {

            let current = arr[i].split(' ');



            if (current[2] === 'going!') {

                if (!arr2.includes(current[0])) {

                arr2.push(current[0]);

                } else {

                    console.log(`${current[0]} is already in the list!`);

                }

            } else if (current[2] === 'not') {

                if (arr2.includes(current[0])) {

                    arr2.splice(arr2.indexOf(current[0]), 1);

                } else {

                    console.log(`${current[0]} is not in the list!`);

                }

            }


        }


        for (let i = 0; i < arr2.length; i++) {

            console.log(arr2[i]);

        }


    }