Last digit
Time Limit: 1000ms
Memory Limit: 65536KB
This problem will be judged on PKU. Original ID: 3406 64-bit integer IO format: %lld Java class name: Main
Description
Determine the last nonzero digit in value of expression
Input
The input contains a single line with n and m separated by one or several spaces; n, m are natural numbers from 1 to 1000000, n ≥ m.
Output
The output contains a single line with the last nonzero digit.
Sample Input
4 2
Sample Output
6