/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
public static void main(String[] args) {
        Scanner odczyt = new Scanner(System.in);
 
        int D,a,b;
        D = odczyt.nextInt();
        double[] tablica = new double[D];
 
        for (int i=0; i<D; i++){
           a = odczyt.nextInt();
           b = odczyt.nextInt();
           tablica[i] = Math.round(Math.pow(a,b)%10);
        }
    for (int i=0; i<D; i++){
        System.out.println(Math.round(tablica[i]));
    }   
    }
}

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MgoyIDMKMyAz

2
2 3
3 3