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#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
long long N,T,z,h,k,l,m,x,n,i;
int main()
{
f>>T;
for(i=1;i<=N;i++) {f>>N;
n=N/10;
if(n%2==0) {m=7;h=3;}
else {m=3;h=7;}
if(n%2==0) {k=4;l=6;}
else {k=6;l=4;}
z=n*7;
if(N%10==0) x=0;
if(N%10==1) x=1;
if(N%10==2) x=1+k;
if(N%10==3) x=1+k+m;
if(N%10==4) x=7+k+m;
if(N%10==5) x=12+k+m;
if(N%10==6) x=18+k+m;
if(N%10==7) x=18+k+m+h;
if(N%10==8) x=18+k+m+h+l;
if(N%10==9) x=27+k+m+h+l;
g<<(z+x)%10<<'\n';}
g.close();
return 0;
}