type vector=array[0..99] of byte;
const c:vector=(1,5,2,8,3,9,2,8,7,7,8,2,9,5,0,6,9,5,4,4,5,9,6,2,7,3,6,2,1,1,2,6,3,9,4,0,3,9,8,8,9,3,0,6,1,7,0,6,5,5,
6,0,7,3,8,4,7,3,2,2,3,7,4,0,5,1,4,0,9,9,0,4,1,7,2,8,1,7,6,6,7,1,8,4,9,5,8,4,3,3,4,8,5,1,6,2,5,1,0,0);
var f,g:text;
    s,nr:string;
    suma,t,i,cod,nu,j:integer;
    l:byte;
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);
     suma:=0;
     l:=length(s);
     nr:=copy(s,l-2,2);
     val(nr,nu,cod);
     if cod=0
     {transf cu succes}
       then writeln(g,c[nu]);
         { begin
           if nu>80 then nu:=nu-80
           else if nu>60 then nu:=nu-60
                else if nu>40 then nu:=nu-40
                     else if nu>20 then nu:=nu-20;
           for j:=1 to nu do
              suma:=suma+c[j];
           writeln(g,suma mod 10);
         end;                      }
    end;
    close(f);
    close(g);
end.