from collections import OrderedDict
number_of_rows = int(input())

list_of_students = []
list_of_grades = []

current_row = 1

for number in range(1, number_of_rows * 2 + 1):
    information = input()

    if current_row % 2 == 0:
        list_of_grades.append(information)
    else:
        list_of_students.append(information)

    current_row += 1

list_of_grades = [float(i) for i in list_of_grades]

information_list = {}

for name, grade in zip(list_of_students, list_of_grades):
    if name not in information_list:
        information_list[name] = grade
    else:
        information_list[name] = float((information_list[name] + grade) / list_of_students.count(name))

orderDict = OrderedDict(sorted(information_list.items(), key=lambda kv: kv[1], reverse=True))

for name in orderDict:
    grade = orderDict[name]
    if grade >= 4.50:
        print(f"{name} -> {grade:.2f}")