### CONTEXT (Previous Events):
<user_input timestamp="882.112782">OC</user_input>
<system_output timestamp="882.131161">[C</system_output>
<user_input timestamp="882.152551">OC</user_input>
<system_output timestamp="882.171709">[C</system_output>
<user_input timestamp="882.211884">OC</user_input>
<system_output timestamp="882.233282">[C</system_output>
<user_input timestamp="882.253027">OC</user_input>
<system_output timestamp="882.274272">[C</system_output>
<user_input timestamp="882.992695">OC</user_input>
<system_output timestamp="883.013662">[C</system_output>
<user_input timestamp="883.234248">OC</user_input>
<system_output timestamp="883.241028">[C</system_output>
<user_input timestamp="883.752963">OD</user_input>
<system_output timestamp="883.773499"/>

### TARGET LINE (Extract and Classify THIS Timestamp):
<user_input timestamp="883.953487">OD</user_input>

Answer: 883.953487, old event