Adjust Friend Visibility

You are given a list of friend names and a sequence of operations. Each operation is one of the following:

• block x — Add friend x to the blocklist. If x is already blocked, no changes are made.
• unblock x — Remove friend x from the blocklist. If x is not blocked, no changes are made.
• list — Print the names of all unblocked friends in lexicographical order, separated by a single space. If no friends are visible, print an empty line.

Process the operations in the given order and output a result for every list command.

inputFormat

The input is read from standard input with the following format:

The first line contains an integer n representing the number of friends. The second line contains n space-separated friend names. The third line contains an integer m representing the number of operations. The following m lines each contain an operation in one of the three formats: "block x", "unblock x", or "list".

It is guaranteed that there is at least one "list" operation.

outputFormat

For each "list" operation, output a single line containing the lexicographically sorted list of unblocked friend names, separated by a single space. If no friends are visible at that moment, output an empty line.## sample

5
alice bob charlie dave eve
6
block alice
list
block bob
list
unblock alice
list

bob charlie dave eve
charlie dave eve
alice charlie dave eve