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
hide comments
Muhammad Ridowan:
20120914 17:36:48
Or better you could lower the time limit, in which no Bigi can solve it. ;) 

Drew Saltarelli:
20120914 17:36:48
you should limit the languages to only those that don't have built in arbitrary big numbers :D 

nthrgeek:
20120914 17:36:48
No it's not,if know basic math Last edit: 20090804 11:09:32 

Sura:
20120914 17:36:48
This problem is very challenging with Java lengthy programming ;) 

Ambuj Varshney:
20120914 17:36:48
for 0^0 solution is 1 , need to add explicitly. Otherwise , judge will show Wrong Answer. 

**:
20120914 17:36:48
The constraints is correct.

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 