### CONTEXT (Previous Events):
<system_output timestamp="1504.84378"/>
<user_input timestamp="1504.858557">OD</user_input>
<system_output timestamp="1504.864435"/>
<user_input timestamp="1504.898029">OD</user_input>
<system_output timestamp="1504.906698"/>
<user_input timestamp="1504.936416">OD</user_input>
<system_output timestamp="1504.947604"/>
<user_input timestamp="1504.976167">OD</user_input>
<system_output timestamp="1504.987748"/>
<user_input timestamp="1505.391423">OC</user_input>
<system_output timestamp="1505.39752">[C</system_output>
<user_input timestamp="1506.031745">OCOC</user_input>
<system_output timestamp="1506.055095">	</system_output>
<user_input timestamp="1506.071233">OC</user_input>

### TARGET LINE (Extract and Classify THIS Timestamp):
<system_output timestamp="1506.09532">	</system_output>

Answer: 1506.09532, old event