#include <stdio.h>
 
int main(void) {
    int n, a, b, r;
 
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf("%d %d", &a, &b);
        r = 1; // 초기값을 1로 설정
        for (int j = 0; j < b; j++) {
            r = (r * a) % 10;
        }
        if (r == 0)
            r = 10;
        printf("%d", r);
 
        // 개행 문자를 출력할 때 n-1번째 입력값까지만 출력하도록 수정
        if (i != n - 1)
            printf("\n");
    }
 
    return 0;
}
 

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NQoxIDYKMyA3CjYgMgo3IDEwMAo5IDYzNQ==

5
1 6
3 7
6 2
7 100
9 635