Write a program that keeps the information about students and their grades.

On the first line, you will receive an integer number representing the next pair of rows. On the next lines, you will receive a student's name and their grade. Keep track of all grades for each student. If the student does not exist, add them.

When you finish reading the data, keep the students with an average grade higher than or equal to 4.50. Order the filtered students by average grade in descending order.

Print the final dictionary with students and their average grade in the following format:

"{name} -> {averageGrade}"

Format the average grade to the 2nd decimal place.

Колеги, отговорите ми излизат правилно, но джъдж ми дава само 12 от 100. Някой може ли да ми каже къде греша? Благодаря предварително! 

https://pastebin.com/UzHvnaMW