#include<stdio.h>
#include<string.h>

const int v[10][10] = {
	{ 0, 1, 5, 2, 8, 3, 9, 2, 8, 7 },
	{ 7, 8, 4, 7, 3, 8, 4, 1, 5, 4 },
	{ 4, 5, 9, 6, 2, 7, 3, 6, 2, 1 },
	{ 1, 2, 8, 1, 7, 2, 8, 5, 9, 8 },
	{ 8, 9, 3, 0, 6, 1, 7, 0, 6, 5 },
	{ 5, 6, 2, 5, 1, 6, 2, 9, 3, 2 },
	{ 2, 3, 7, 4, 0, 5, 1, 4, 0, 9 },
	{ 9, 0, 6, 9, 5, 0, 6, 3, 7, 6 },
	{ 6, 7, 1, 8, 4, 9, 5, 8, 4, 3 },
	{ 3, 4, 0, 3, 9, 4, 0, 7, 1, 0 }
};

int main()
{
	int t, aux, c1, c2,i;
	char n[101];

    FILE *f=fopen("cifra.in","r"),*g=fopen("cifra.out", "w");

	fscanf(f,"%d", &t );

	for(i = 1; i <= t; i++ ) {
		fscanf(f,"%s", n );
		aux= strlen( n );

		if( aux == 1 ) c1 = 0;
            else c1 = n[aux-2] - '0';
		c2 = n[ aux - 1 ] - '0';

		printf("%d\n", v[c1][c2] );
	}

	return 0;
}