#include <fstream>

using namespace std;

ifstream in("test.in");
ofstream out ("test.out");

int T,N[101]={},s[101]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0,0},val[10][4]={0,0,0,0,1,1,1,1,6,2,4,8,1,3,9,7,6,4,6,4,5,5,5,5,6,6,6,6,1,7,9,3,6,8,4,2,1,9,1,9};
int getlast2dig()
{
	int lenght=0;
	char c=' ';
	while(c==' '||c=='\n')
		in.get(c);
	while(c>='0'&&c<='9')
	{
		lenght++;
		N[lenght]=c-'0';
		in.get(c);
	}
	return N[lenght]+N[lenght-1]*10;
}
int main()
{
	in>>T;
	for(int i=1;i<T;i++)
		out<<s[getlast2dig()]<<'\n';
	char ch;
	int l=0;
	while(in>>ch)
	{
		l++;
		N[l]=ch-'0';
	}
	out<<s[N[l]+N[l-1]];
	return 0;
}