uses crt;
var f,g:text;
    uc,s,i,j:integer;
    suma,suma1:longint;
    n:1..30000;

begin
clrscr;
assign(f,'cifra.in');
reset(f);
assign(g,'cifra.out');
rewrite(g);
read(f,n);
for i:=1 to n do begin
read(f,s);
suma1:=1;
for j:=1 to i do begin
                 s:=s mod 10;
                 suma1:=suma1*s;
                 suma1:=suma1 mod 10;
                 end;
suma:=suma+suma1;
suma:=suma mod 10;
writeln(g,suma)
end;
close(f);
close(g);
end.