var a:array[1..20] of byte;
    s:string[101];
    f,g:text;
    n,h,x,m,t,i:integer;

BEGIN
a[1]:=1;a[2]:=5;a[3]:=2;a[4]:=8;a[5]:=3;
a[6]:=9;a[7]:=2;a[8]:=8;a[9]:=7;a[10]:=7;
a[11]:=8;a[12]:=4;a[13]:=7;a[14]:=3;a[15]:=8;
a[16]:=4;a[17]:=1;a[18]:=5;a[19]:=4;a[20]:=4;
assign(f,'cifra.in');reset(f);
readln(f,t);
assign(g,'cifra.out');rewrite(g);
for i:=1 to t do begin
    readln(f,s);
    if length(s)>1 then val(copy(s,length(s)-1,2),n,h)
        else val(s,n,h);
    x:=a[n mod 20];
    m:=(n mod 100)div 20;
    x:=x+4*(m);
    writeln(g,x mod 10);
end;
close(f);
close(g);
end.