program perevertish;
var x,a,b,c: integer;
begin
writeln ('vvedit triohznachne chislo');
readln (x);

a:= x div 100;
b:= x div 10 mod 10;
c:= x mod 10;

if (a=c) then writeln ('yes')
else writeln ('no');
readln
end.