#include <cstdio>
#include <cmath>

int n,i,j;
int s,x;

struct a
{
    char a[10];
} b[10];





int main()
{


    freopen("cifra.in", "r" , stdin);

    scanf("%d\n",&n);


    for (i=0;i<n;i++)
    scanf("%s\n",b[i].a);

    int k,t,l;
    j=0;
    freopen("cifra.out", "w", stdout);
    for (i=0;i<n;i++)
    {
        for (l=0;l++;) if (b[i].a[l]==0) break;

        k=l;
        j=0;
        while (k!=0) {x+= ((int(b[i].a[j]) ) - 48) * pow(10,k-1);k--;j++;  }
         l=0;
         for (t=0;t<n;t++)
     {
         s=0;
         {
             for (l=1;l<=x;l++)
                s=s+ pow (l,l);
         }

     }


printf("%d\n",s%10);
        x=0;}

        fclose(stdout);



    return 0;
}