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

### Instruction:
WHAT IS THE SUM OF AST AVG WITH RANK 5 AND GAMES BIGGER THAN 108?

### Inputs:
table_name: table, columns: ['Rank', 'Player', 'Years', 'Games', 'Ast. Avg.', 'Total Assists']

### Response:
SELECT SUM Ast. Avg. FROM table WHERE Rank = 5 AND Games > 108