function schoolRegister(input) {
    let data = input.slice()
    let register = []
    for (let element of data) {
        let infoLine = element.split(",")
        //console.log(infoLine)
        let studentName = infoLine[0].split(":")
        //console.log(studentName)
        let name = studentName[1]
        let gradeInfo = infoLine[1].split(": ")
        let grade = Number(gradeInfo[1])+1
        //console.log(grade)
        let scoreInfo = infoLine[2].split(": ")
        let score = Number(scoreInfo[1])
        // console.log(score)
        if (score > 3 && grade <= 12) {
            let studentInfo = {
                name,
                grade,
                score,
            }
            register.push(studentInfo)
        }
    }
    let sorted = {}
    register.forEach(students => {
        //console.log(students)
        let currentGrade = students.grade
        //console.log(students.grade)
        if (currentGrade in sorted) {
            sorted[currentGrade].push(students)

        } else {
            sorted[currentGrade] = [];
            sorted[currentGrade].push(students);
        }

    })

    for (let grade of Object.keys(sorted)) {
//console.log(grade)
        console.log(`${grade} Grade`)
        let studentsAtgrade= []
        let allScore = 0
        //console.log(sorted[grade])
        for (student of sorted[grade]){
            studentsAtgrade.push(student.name)
            allScore+=student.score
        }
        let averageScore = allScore / sorted[grade].length
       console.log(`List of students:${studentsAtgrade.join(",")}`)
       console.log(`Average annual score from last year: ${averageScore.toFixed(2) }`)
       console.log()
    }

}