### CONTEXT (Previous Events):
<system_output timestamp="138.156646">B</system_output>
<user_input timestamp="139.015673">[D</user_input>
<system_output timestamp="139.021712"/>
<user_input timestamp="139.65971">[D</user_input>
<system_output timestamp="139.666983"/>
<user_input timestamp="139.717746">[D</user_input>
<system_output timestamp="139.726927"/>
<user_input timestamp="139.757894">[D</user_input>
<system_output timestamp="139.766062"/>
<user_input timestamp="139.796774">[D</user_input>
<system_output timestamp="139.805335"/>
<user_input timestamp="139.835178">[D</user_input>
<system_output timestamp="139.844837"/>
<user_input timestamp="139.874711">[D</user_input>

### TARGET LINE (Extract and Classify THIS Timestamp):
<system_output timestamp="139.884674"/>

Answer: 139.884674, old event