#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
// 0, 1, 4, 7, 6, 5, 6, 3, 6, 9
// 0, 1, 5, 2, 8, 3, 9, 2, 8, 7
int main()
{
  int t, s[] = {0, 1, 5, 2, 8, 3, 9, 2, 8, 7},lg, c = 0;
  char n[105];
  fin >> t;
  fin.get();
  while(t--)
  {
    fin.getline(n, 105);
    lg = strlen(n);
    if(lg == 1)
      fout << s[n[0] - '0'] << '\n';
    else
      fout << (7 * (n[lg - 2] - '0') + s[n[lg - 1] - '0'])%10 << '\n';
  }

  return 0;
}