program filip;
var a,a1,a2,a3,a4,b,b1,b2,b3,b4:integer;
begin
readln(a);
readln(b);
a1:= a mod 10;
a2:= a div 10;
a3:= a2 mod 10;
a4:= a2 div 10;
b1:= b mod 10;
b2:= b div 10;
b3:= b2 mod 10;
b4:= b2 div 10;
if a1>b1 then write(a1,a3,a4)
else
write(b1,b3,b4);
end.