#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

ifstream f("cifra.in");
ofstream g("cifra.out");

int a[11][11];

void matrice()
{
    a[1][0]=1;
    a[1][1]=1;
    a[1][2]=1;
    a[1][3]=1;

    a[2][1]=2;
    a[2][2]=4;
    a[2][3]=8;
    a[2][0]=6;

    a[3][1]=3;
    a[3][2]=9;
    a[3][3]=7;
    a[3][0]=1;

    a[4][1]=a[4][3]=4;
    a[4][0]=a[4][2]=6;

    a[5][0]=a[5][1]=a[5][2]=a[5][3]=5;

     a[6][0]=a[6][1]=a[6][2]=a[6][3]=6;

     a[7][1]=7;
     a[7][2]=9;
     a[7][3]=3;
     a[7][0]=1;

     a[8][1]=8;
     a[8][2]=4;
     a[8][3]=2;
     a[8][0]=6;

     a[9][1]=a[9][3]=9;
     a[9][0]=a[9][2]=1;

}

void Make_the_sum(int nr,int &s)
{
    int i;
    for(i=1;i<=nr;i++)
    {
        s=s+a[i%10][i%4];
        s%=10;
    }
    g<<s<<endl;
}


void Read()
{
    int t,i,number,s;
    char a[101];
    f>>t;
    for(i=1;i<=t;i++)
        {
            s=0;
            f.get();
            f.get(a,101,'\n');
            if(  ( (a[strlen(a)-2]-'0')>=0 ) && ( (a[strlen(a)-2]-'0')<=9 ) )
            number = (a[strlen(a)-2]-'0')*10 + (a[strlen(a)-1]-'0');
            else
                 number =  (a[strlen(a)-1]-'0');
            Make_the_sum(number,s);

        }
}



int main()
{
matrice();
Read();
}