9. Company Users

command = input()
company = {}

while not command == "End":
    company_name, employee_id = command.split("->")

    if company_name not in company:
        company[company_name] = []
    company[company_name].append(employee_id)

    if employee_id in company.keys():
        del employee_id

    command = input()


filtered_companies = sorted(company.items(), key=lambda kvp: kvp[0])

for company_name, employee_id in filtered_companies:
    print(f"{company_name}")
    for el in employee_id:
        print(f"--{el}")