#include<fstream>
using namespace std;

int v[10][10], t, i;
char  n[101];

int main()
{ifstream f("cifra.in");
ofstream g("cifra.out");
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, 0, 5, 0, 6, 3, 7, 6},
{6, 7, 1, 8, 4, 9, 5, 8, 3, 3},
{3, 4, 0, 3, 9, 4, 0, 7, 1, 0}};

f>>t;
for(i=1;i<=t;i++)
	{f>>n;
	int l=strlen(n);
	if(l==1)
		g<<v[0][n[l-1]-'0']<<endl;
	else
		g<<v[n[l-2]-'0'][n[l-1]-'0']<<endl;
	}
	
return 0;
}