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
import math

T = int(raw_input())

while(T):
    T -= 1
    s = raw_input()
    strr = s.split()
    a = int(strr[0])
    b = int(strr[1])
    if b == 0:
        print "1"
    else:
        a %= 10
        b %= 4
        if b==0:
            b=4
        print pow(a, b) % 10