### CONTEXT (Previous Events):
<user_input timestamp="40519.224386">'</user_input>
<system_output timestamp="40519.226577">'</system_output>
<user_input timestamp="40519.568895">a</user_input>
<system_output timestamp="40519.584705">a</system_output>
<user_input timestamp="40519.768404">d</user_input>
<system_output timestamp="40519.774066">d</system_output>
<user_input timestamp="40519.991981">d</user_input>
<system_output timestamp="40520.004857">d</system_output>
<user_input timestamp="40520.174152"> </user_input>
<system_output timestamp="40520.192313"> </system_output>
<user_input timestamp="40538.807774">OA</user_input>
<system_output timestamp="40538.809194">add package_config/HWPHYS</system_output>
<user_input timestamp="40539.522459">OD</user_input>
<system_output timestamp="40539.54101"/>

### TARGET LINE (Extract and Classify THIS Timestamp):
<user_input timestamp="40540.19191">OD</user_input>

Answer: 40540.19191, old event