A certain identification code is a list of five symbols:
$$S_{1}$$:$$S_{2}$$:$$D_{1}$$:$$D_{2}$$:$$D_{3}$$
Each of the first 2 symbols must be one of the 26 letters of the English alphabet, and each of the last 3 symbols must be one of the 10 digits. (Repeated letters and digits are allowed.) What is the total number of different identification codes?
答案：B