#include<fstream>
#include<cstring>
#include<cmath>
using namespace std;
#define dim 30001
struct tip{char nr[101];unsigned short int d;}v[dim];
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    int i,k=0,k1,j,t,s=0;
    f>>t;
    for(i=1;i<=t;i++)
    {
        f>>v[++k].nr; k1=0;
        v[k].d=v[k].nr[strlen(v[k].nr)-1]-'0';
    }
    f.close();
    for(i=1;i<=k;i++)
    {
        s+=pow((double)v[i].d,(double)i);
        g<<s%10<<'\n';
    }
    g.close();
    return 0;
}