#include <iostream>
#include <fstream>

using namespace std;
int i,x,p,d,s,j2,j,t,i2,n1,uc,uc2,nou=1;
string n;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int v1[]=
        {
             1, 5, 2, 8, 3, 9, 2, 8, 7
        };
int v2[]=
        {
             1, 7, 0, 6, 1, 7, 4, 8, 7
        };
int main()
{
    fin>>t;
    for(i=1;i<=t;i++)
    {
        uc=0;
        s=0;
        fin>>n;
        if(n.size()!=1)
        {
            x=n[n.size()-2]-'0';
            uc=x*7%10;
        }
        i2=n[n.size()-1]-'0'-1;
        if (x%2==0)
            uc=uc+v1[i2];
        else
            uc=uc+v2[i2];

        fout<<uc%10<<endl;
    }
for(i=0;i<=8;i++)
    cout<<v1[i]<<"  "<<v2[i]<<endl;
    cout<<n[(n.size()-1)]-'0'-1;
    return 0;
}