input: 
^Verbcj<SV><vblex><ifi><p3><sg>{^come<vblex><ifi><p3><sg>$}$ ^pr<PREP>{^to<pr>$}$ ^det_nom<SN><f><sg>{^the<det><def><3>$ ^beach<n><3>$}$

saasbook@saasbook:~$ cat input.in | python stream_processor.py 
Verbcj
<SV><vblex><ifi><p3><sg>
^come<vblex><ifi><p3><sg>$

pr
<PREP>
^to<pr>$

det_nom
<SN><f><sg>
^the<det><def><3>$ ^beach<n><3>$