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The Last Non-zero Digit
In this problem you will be given two decimal integer number 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 contains several lines of input. Each line of the input file contains two integers N (0 <= N<= 20000000), M (0 <= M <= N).
For each line of the input 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.
10 10 10 5 25 6
8 4 2
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