students_count = int(input())
students_list = {}
for student in range(students_count):
    name, grade = tuple(input().split())
    grade = float(grade)
    if name not in students_list:
        students_list[name] = []
    students_list[name].append(grade)
for key, value in students_list.items():
    print(f"{key} -> " + ' '.join([f"{grade:.2f}" for grade in value]) + f" (avg: {(sum(value) / len(value)):.2f})")