friend_list_maintenance

friends = input().split(", ")

while True:
    command = input().split()
    if "Report" in command:
        break
    elif "Blacklist" in command:
        name = command[1]
        if name in friends:
            index = friends.index(name)
            friends[index] = "Blacklisted"
            print(f"{name} was blacklisted.")
        else:
            print(f"{name} was not found.")
    elif "Error" in command:
        index = int(command[1])
        if 0 <= index < len(friends) and friends[index] != "Blacklisted" and friends[index] != "Lost":
            print(f"{friends[index]} was lost due to an error.")
            friends[index] = "Lost"
    elif "Change" in command and 0 <= int(command[1]) < len(friends):
        index_old = int(command[1])
        new_name = command[2]
        print(f"{friends[index_old]} changed his username to {new_name}.")
        friends[index_old] = new_name

count_blacklisted = len([s for s in friends if s == "Blacklisted"])
count_lost = len([s for s in friends if s == "Lost"])
print(f"Blacklisted names: {count_blacklisted}")
print(f"Lost names: {count_lost}")
print(*friends)