Friendlist Maintence

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

command = input()

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

blacklisted = [x for x in friend_list if x == "Blacklisted"]
lost = [x for x in friend_list if x == "Lost"]
print(f"Blacklisted names: {len(blacklisted)}\nLost names: {len(lost)}")
print(" ".join(friend_list))