LASTDIG  The last digit
Nestor 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 him two numbers a and b. The problem consist of finding the last digit of the potency of base a and index b. Help Nestor with his problem. You are given two integer numbers: the base a (0 <= a <= 20) and the index b (0 <= b <= 2,147,483,000), a and b both are not 0. 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.
Example
Input: 2 3 10 6 2
Output: 9 6
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spartax:
20170428 20:21:45
O(t) solution 

valkyre:
20170410 19:37:43
getting a TLE. Please help. 

lvlpbl:
20170328 00:29:02
care about 10^0 

krishna29:
20170323 18:36:19
I am new here , i see comments AC in one go . whats that mean? 

da_201501181:
20170306 15:34:00
AC in one GO..!! Mod 4 logic simple..!! Last edit: 20170306 16:06:16 

rayhan50001:
20170226 22:05:33
easy problem.. ac in one go bigmod :D 

nitisha1:
20170224 14:13:34
finally AC!!! 

draculla:
20170210 16:28:14
quite simple..AC in one go...just use pen and paper .. 

rohit9934:
20170210 10:58:02
AC in one go for the 1st time in C++.Was that even a problem?Too easy 

akhil9093:
20170208 22:28:40
couldn't do it in one go .. was missing a single case..!!but overall the question was totally pattern dependent 
Added by:  Jose Daniel Rodriguez Morales 
Date:  20081201 
Time limit:  1s 
Source limit:  700B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: GOSU 
Resource:  Own 