many = int(input())
students_dict = {}
for _ in range(many):
    student, grade = input(), float(input())
    if student not in students_dict:
        students_dict[student] = []
    students_dict[student].append(grade)
students_avg_dict = dict([(key, sum(value) / len(value))
                         for (key, value) in students_dict.items()])
students_fil_dict = dict([(k, v)
                          for (k, v) in students_avg_dict.items() if v >= 4.5])
students_sorted_dict = dict(sorted(students_fil_dict.items(), key=lambda x: x[1], reverse=True))
for k, v in students_sorted_dict.items():
    print(f'{k} -> {v:.2f}')