Rohit was doing the work of his math class about three days but he is tired of make operations a lot and he should deliver his task tomorrow. His math’s teacher gives two numbers a and b. The problem consist in find the last digit of the potency of base a and index b. Help Rohit with his problem. You are given two integer numbers: the base a (number of digits d, such that 1 ≤ d ≤ 1000) and the index b (0 ≤ b ≤ 922*10^15). You
have to find the last digit of a^b.

Input

The first line of input contains an integer t, the number of test cases (t ≤ 30). t test cases follow. For each test case will appear a and b separated by space.

Output

For each test case output an integer per line representing the result.

SAMPLE INPUT
3
3 10
6 2
150 53

SAMPLE OUTPUT
9
6
0
for i in xrange(input()):
	a,b=[int(x) for x in raw_input().split()]
	y=a%10
	if b==0:
		print 1
		continue
	if y in [0,1,5,6]:
		print y
		continue
	if y in [4,9]:
		print (y**((b-1)%2+1))%10
		continue
	if y in [2,3,7,8]:
		print (y**((b-1)%4+1))%10
		continue