var uc,i,m,n,c,t:longint;
    x:array[1..9] of integer;
    f,g:text;
begin
assign(f,'cifra.in'); reset(f);
assign(g,'cifra.out');  rewrite(g);
x[1]:=1;
x[2]:=5;
x[3]:=2;
x[4]:=8;
x[5]:=3;
x[6]:=9;
x[7]:=2;
x[8]:=8;
x[9]:=9;
read(f,t);
for i:=1 to t do begin
  read(f,n);
  c:=n mod 10;
  m:=n div 10;
  uc:=m*x[9];
  uc:=uc+x[c];
  uc:=uc mod 10;
  writeln(g,uc);
end;
close(g);
close(f);
end.