#include <fstream>
#include<cstring>
#include<cmath>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");

char n[105];
int v[101];
int main()
{
    int t,k,i,u=0,s=0,r,q,z=0;
    fin>>t;
    for(i=1;i<=99;i++)
    {
        r=i%10;
            q=i%4;if(q==0)q=4;
           if(r>0){ s=s+pow(r,q);}
           else s=s;
            s=s%10;v[i]=s;
    }
    while(t!=0)
    {
        fin>>n;
        s=0;u=0;z=0;
       if(strlen(n)<=1) u=n[strlen(n)-1]-'0';
       else {z=n[strlen(n)-2]-'0';u=n[strlen(n)-1]-'0';}
     s=(s+v[z*10+u])%10;
        t--;
        fout<<s<<"\n";
    }
    return 0;
}