//Palindromic String
// Sample code to perform I/O:

process.stdin.resume();
process.stdin.setEncoding("utf-8");
var stdin_input = "";

process.stdin.on("data", function (input) {
    stdin_input += input;                               // Reading input from STDIN
});

process.stdin.on("end", function () {
   main(stdin_input);
});

function main(input) {
  
  var data= input.toString().split("\n");
    process.stdout.write(palindrome(data[0]));       // Writing output to STDOUT
}

// Warning: Printing unwanted or ill-formatted data to output will cause the test cases to fail



// Write your code here
// Sample code to perform I/O:
//Enter your code here
function palindrome(s) {
    
    var len = s.length;
    var midle = Math.floor(len/2);

    for (var i= 0; i<midle; i++) {
        if (s[i] !== s[len-1-i]) return "NO"
    }    
    return "YES";    
}