const v:array[0..100] of byte=(0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,10,6,1,7,
10,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,10,5,1,4,10,9,9,10,6,9,5,10,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,10,3,9,4,10,7,1,10,10);
var s,s1:string;
    p,i,c,n,t:integer;
    f,g:text;

begin
  assign(f,'cifra.in');
  reset(f);
  assign(g,'cifra.out');
  rewrite(g);
  readln(f,t);
  for i:=1 to t do
    begin
      readln(f,s);
      p:=length(s)-1;
      if p<1 then p:=1;
      s1:=copy(s,p,2);
      val(s1,n,c);
      writeln(g,v[n] mod 10);
    end;
  close(f);
  close(g);
end.