Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_44739 ( "Coach" text, "First Yr" real, "Last Yr" real, "W-L%" real, "G > .500" real, "Yr plyf" real, "G plyf" real, "W plyf" real, "L plyf" real )

### Question ###
What is the average last yr with an l plyf less than 0?

### Accurate SQL ###

SELECT AVG("Last Yr") FROM table_44739 WHERE "L plyf" < '0'