Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Name', 'Gain', 'Loss', 'Long', 'Avg/G']

### Response:
SELECT SUM Gain FROM table WHERE Avg/G = 26.8 AND Loss < 13