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_name_43 (gain INTEGER, avg_g VARCHAR, loss VARCHAR)

### Question ###
What are the gains for the player with average of 26.8 and lost yard fewer than 13?

### Accurate SQL ###

SELECT SUM(gain) FROM table_name_43 WHERE avg_g = "26.8" AND loss < 13