### CONTEXT (Previous Events):
<user_input timestamp="86.040007">i</user_input>
<system_output timestamp="86.054338">i</system_output>
<user_input timestamp="86.320171">t</user_input>
<system_output timestamp="86.340142">t</system_output>
<user_input timestamp="86.378921"> </user_input>
<system_output timestamp="86.381821"> </system_output>
<user_input timestamp="86.578771">s</user_input>
<system_output timestamp="86.587041">s</system_output>
<user_input timestamp="86.818546">t</user_input>
<system_output timestamp="86.831835">t</system_output>
<user_input timestamp="86.918198">a</user_input>
<system_output timestamp="86.934021">a</system_output>
<user_input timestamp="87.038287">t</user_input>
<system_output timestamp="87.057652">t</system_output>

### TARGET LINE (Extract and Classify THIS Timestamp):
<user_input timestamp="87.177304">u</user_input>

Answer: 87.177304, old event