const v:array[0..99] of integer=
(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);
var
f,g:text;
t,i,x,j:integer;
s,s2:string;
begin
     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 x:=ord(s[1])-48
                        else x:=(ord(s[length(s)-1])-48)*10+(ord(s[length(s)]
                        )-48);
         writeln(g,v[x]);
    end;
    close(f);
    close(g);
    end.