#include<cstdio>
#include<cstring>
using namespace std;
int n,i,j,k,T;
int v[]={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};
char s[200];
int main()
{
	freopen("cifra.in","r",stdin);
	freopen("cifra.out","w",stdout);
	scanf("%d\n",&T);
	for (i=1;i<=T;i++)
	{
		gets(s);n=strlen(s);k=0;
		if (n<=1) k=s[n-1]-'0';else k=(s[n-2]-'0')*10+(s[n-1]-'0');
		k=k%10;
		printf("%d\n",v[k]);
	}
	return 0;
}