Program Cifra_arena;
const ultim:array[0..99] of byte=(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 fi,fo:text;  k,i,r : longint;s:string; code:integer;
begin assign(fi,'cifra.in'); reset(fi); assign(fo,'cifra.out'); rewrite(fo); readln(fi,k);
   for i:=1 to k do begin readln(fi,s); val(copy(s,length(s)-1,2),r,code); writeln(fo,ultim[r]); end; close(fi);close(fo);
end.