You are given two integer numbers , the base a (number of digits d, such that 1 <= d <= 1000) and the index b. You have to find the last digit of ab.
The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. The first line of each test case contains the numbers a and b.
Print the last digit of ab. Print the answer for each test case in a new line.
1 <= T <= 100
1 <= a,b <= 101000
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