;-)

function solve(input) {
    let result = input.reduce((acc, curr) => {
        let [student, gradeInfo, scoreInfo] = curr.split(", ")
        let name = student.split(": ")[1]
        let grade = Number(gradeInfo.split(": ")[1])
        let score = Number(scoreInfo.split(": ")[1])

        if (score >= 3.00) {
            if (acc[grade]) {
                acc[grade][name] = score;
            } else {
                acc[grade] = {};
                acc[grade][name] = score;
            }
        };

        return acc;
    }, {});

    function avg() {
        // implement code
    }

    function printStudents() {
        // implement code
    }

    /* 
        Result in this case does not need to be sorted because "The iteration order for objects follows a certain set of rules since ES2015,
        but it does not(always) follow the insertion order. Simply put, the iteration order is a combination
        of the insertion order for strings keys, and ascending order for number - like keys"
        https://stackoverflow.com/questions/5525795/does-javascript-guarantee-object-property-order 
    */
    // let sortedGrades = Object.entries(result).sort((a, b) => Number(a[0]).grade - Number(b[0]).grade)

    // Practise Tip: Try also to work directly with the result object and iterate through each of its properties
    /*  
        for (const iterator in result) {
        console.log(iterator);
        }
    */
    sortedGrades = Object.entries(result);

    sortedGrades.forEach(([grade, students]) => {
        console.log(`${grade} Grade`);
        console.log(`List of students: ${printStudents(students)}`);
        console.log(`Average annual score from last year: ${avg(students)}`);
        console.log();
    })
}