i,x:longint;
st:string;
begin
read(a,b);
if a<b then begin write(’-’);str(b-a,st);end
else str(a-b,st);
for i:=length(st) downto 1 do begin inc(x);
if x mod 3=0 then insert(’,’,st,i);end;
write(st);
end.
- -!
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