program cifra;
type vector=array[0..99]of byte;
var f,g:text;
    n,t,j,i,ci,p:longint;
    v:vector=(0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0);

    x,y:char;
begin
assign(f,'cifra.in');
assign(g,'cifra.out');
reset(f);
rewrite(g);
readln(f,t);
for j:=1 to t do
  begin
    x:='a';
    while not eoln(f) do
      begin
        y:=x;
        read(f,x);
      end;
    readln(f);
    if (y<>'a')then
      n:=(ord(y)-ord('0'))*10+ord(x)-orD('0') else
      n:=ord(x)-ord('0');
    writeln(g,v[n]);

  end;
close(f);
close(g);
end.