3550：AT – sequence

AT-sequences are command strings used to control modems. An AT-sequence is a string of no more than 500 characters consisting of the prefix 'AT' followed by some commands immediately one after another without any separators. Here is a simplified description of the modem commands.

Each command consists of a header and an optional numeric value (non-negative integer containing no more than 4 digits). If there is a value in the command, it is separated from the header by the character '='.

The header itself also consists of two parts. The first, mandatory, part of a header has one of the following forms:

• one or two upper-case Latin letters;
• one of the symbols '&', '#', '@', followed by one upper-case Latin letter.

The second, optional part of a header is a non-negative integer containing no more than 20 digits.

Spaces are not allowed in the command notation. If the command notation contains only one or two Latin letters, this command can't precede another one with the notation started by a letter.

The task is to determine all commands included in the structure of a correct AT-sequence.

The input contains one line with the source AT-sequence.

Each line of the output contains one command from the AT-sequence given in the input file. The commands must be listed in the same order as in the AT-sequence. If AT-sequence have no commands you must generate nothing.