For the numbers 13379, 9999, 8780, and 1189, find the number before and after each.

$$13379 + 1 = 13380$$

The numbers are 13378 and 13380.

$$9999 + 1 = 10000$$

The numbers are 9998 and 10000.

$$8780 + 1 = 8781$$

The numbers are 8779 and 8781.

$$1189 + 1 = 1190$$

The numbers are 1188 and 1190.

$$\boxed{\begin{array}{ll} \text{(i)} & 13378, 13379, 13380 \\ \text{(ii)} & 9998, 9999, 10000 \\ \text{(iii)} & 8779, 8780, 8781 \\ \text{(iv)} & 1188, 1189, 1190 \end{array}}$$