#include<fstream.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>

int main()
{
int i,t,a,d,b,j;
char s[102],c[3];
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
for (i=1;i<=t;i++)
	{
	f>>s;
	if (strlen(s)<=2) strcpy(c,s);
		else {c[0]=s[strlen(s)-2];c[1]=s[strlen(s)-1];c[2]=0;}
	a=atoi(c);       //in a am ultimele 2oua cifre ale nr
	d=(a/10)*7;   //in d calculez suma cifrelor
	j=a%10;
	for (b=1;b<=j;b++)
		if (b==1 || b==5 || b==6) d=(d+b)%10;
			else {
		     a=b%4;
		     if (a==0) a=4;
		     d=(d+(int)pow(b,a))%10;
		     }
	g<<d<<"\n";
	}
g.close();
f.close();
return 0;
}