#include<cstdio>
#include<cstdlib>
#include<cstring>
int l,v,u,m,i,n;
int x[20]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4};
char nr[102];
int main()
{
	freopen("cifra.in","r",stdin);
	//freopen("cifra.out","w",stdin);
	for (scanf("%d", &n); n; n--)
	{
	    scanf("%s",nr);
        if(strlen(nr)<=2)
            u=atoi(nr);
        else
            u=atoi(&nr[l-2]);
        v=u%20;
        m=u/20;
        m=4*m+x[v];
        m=m%10;
        printf("%d\n",m);
    }
	return 0;
}