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The Last Non-zero Digit

By Shahriar Manzoor BD Bangladesh

Timelimit: 8

In this problem it will be given to you two decimal integer numbers N, M. You will have to find the last non-zero digit of the NPM. This means no of permutations of N things taking M at a time.


The input file contains several lines of input. Each line of the input file contains two integers N (0 ≤ N ≤ 20000000), M (0 ≤ N). Input is terminated by end-of-file.


For each line of the input file you should output a single digit, which is the last non-zero digit of NPM. For example, if NPM is 720 then the last non-zero digit is 2. So in this case your output should be 2.

Sample Input Sample Output

10 10
10 5
25 6