using static System.Console;
using System.Linq;
using System.Numerics;
using System.Text.RegularExpressions;
 
public static class Extension
{
    public static string rev(this string s)
    {
        return new string(s.Reverse().ToArray());
    }
}
 
class Program
{
    static BigInteger[] NearestPalindromeNumbers(BigInteger n)
    {
        string s = n.ToString();
        if (new Regex("^10+$").Match(s).Success) return new[] {n - 1, n + 1};
 
        int j = s.Length / 2;
        int i = s.Length - j;
        string a = s.Substring(0, i);
        string b = a.Substring(0, j).rev();
        var x = BigInteger.Parse(a + b);
        if (x == n) return new[] {x};
 
        a = (BigInteger.Parse(a) + (x < n ? 1 : -1)).ToString();
        b = a.Substring(0, j).rev();
        var y = BigInteger.Parse(a + b);
        var d = BigInteger.Abs(x - n) - BigInteger.Abs(y - n);
        if (d < 0) return new[] {x};
        if (d > 0) return new[] {y};
        return x < y ? new[] {x, y} : new[] {y, x};
    }
 
    static BigInteger[] q = {0, 5, 17, 100, 2024, 12345679042654321, BigInteger.Parse("31415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989")};
 
    static void Main()
    {
        foreach (var n in q) WriteLine($"[{string.Join(", ", NearestPalindromeNumbers(n))}]");
    }
}

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