Hi There,
Welcome to the board..
Copy this into your third column..
=IF(ISNA(MATCH(B1,$A$1:$A$15,0)),"",B1)
Paste the shorter list into the first column and then the longer list in the second column.
You might want to extend the range also ",$A$1:$A$[to last cell of second column],0"..
Hope this works..
Have a good weekend..
Jakob