On a Save The Wetlands license plate, there are always two letters (e.g., SW) followed by four

Question:

On a "Save The Wetlands" license plate, there are always two letters (e.g., "SW") followed by four digits, and thus 10,000 combinations of plates are available for each pair of letters. If the four digits are selected randomly, and all 10,000 possibilities are equally likely, what is the probability that the four digits are distinct and in ascending order?