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var
s: ansistring;
function ispalindrome(s: ansistring): boolean;
var
n, i: int32;
begin
n := length(s);
for i := 1 to n do
if s[i] <> s[n - i + 1] then
exit(false);
ispalindrome := true
end;
begin
readln(s);
if ispalindrome(s) then
writeln('YES')
else
writeln('NO')
end.
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