How to loop through a directory recursively to delete files with certain extensions

I need to loop through a directory recursively and remove all files with extension `.pdf` and `.doc`. I'm managing to loop through a directory recursively but not managing to filter the files with the above mentioned file extensions. My code so far ``` #/bin/sh SEARCH_FOLDER="/tmp/*" for f in $SEARCH_FOLDER do if [ -d "$f" ] then for ff in $f/* do echo "Processing $ff" done else echo "Processing file $f" fi done ``` I need help to complete the code, since I'm not getting anywhere.