#include<fstream>
#include<cmath>
#include<cstring>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int v[]= {8,4,7,3,8,4,1,5,4,4,0,1,5,2,8,3,9,2,8,7,7};
int main()
{
    int i,t,cif,nr,sum=0;
    char s[128];
    fin>>t;
    fin.get();
    for(i=0;i<t;i++)
    {
        fin.getline(s,102,'\n');
        cif=strlen(s);
        if(cif>1)
        {
            nr=s[cif-1]-'0'+((s[cif-2]-'0')%2)*10;
            sum=v[nr];
            nr=(s[cif-2]-'0');
            nr=nr-nr%2;
            nr=nr/2;
            sum=sum+(nr*v[20])%10;
            fout<<sum%10<<'\n';
        }
        else
            fout<<v[s[0]-'0']<<'\n';
    }
    return 0;
}