function solve(params) {
    let lessons = params.shift().split(', ');
    let commands = params.slice(0, params.length - 1).map(x => x.split(':'));

    for (let token of commands) {
        let command = token[0];
        let lessonTitle = token[1];

        if (command === 'Add' && !lessons.includes(lessonTitle)) {
            lessons.push(lessonTitle);
        } else if (command === 'Insert' && !lessons.includes(lessonTitle)) {
            let index = +token[2];

            if (index >= 0 && index < lessons.length) {
                lessons.splice(index, 0, lessonTitle);
            }
        } else if (command === 'Remove') {
            lessons = lessons.filter(x => x !== lessonTitle && x !== lessonTitle + '-Exercise');
        } else if (command === 'Swap') {
            let secondTitle = token[2];
            let firstIndex = lessons.indexOf(lessonTitle);
            let secondIndex = lessons.indexOf(secondTitle);
            if (firstIndex !== -1 && secondIndex !== -1) {
                let tempLesson = lessons[firstIndex];
                lessons[firstIndex] = lessons[secondIndex];
                lessons[secondIndex] = tempLesson;

                if (lessons[firstIndex + 1] === lessonTitle + '-Exercise') {
                    let exercise = lessons.splice(firstIndex + 1, 1);
                    lessons.splice(secondIndex + 1, 0, exercise);
                }

                if (lessons[secondIndex + 1] === secondTitle + '-Exercise') {
                    let exercise = lessons.splice(secondIndex + 1, 1);
                    lessons.splice(firstIndex + 1, 0, exercise);
                }
            }
        } else if (command === 'Exercise') {
            let index = lessons.indexOf(lessonTitle);

            if (index === -1) {
                lessons.push(lessonTitle);
                lessons.push(lessonTitle + '-Exercise');
            } else if (lessons[index + 1] !== lessonTitle + '-Exercise') {
                lessons.splice(index + 1, 0, lessonTitle + '-Exercise');
            }
        }
    }

    for (let i = 0; i < lessons.length; i++) {
        console.log(`${i + 1}.${lessons[i]}`);
    }
}