import std.algorithm;
import std.bigint;
import std.math;
import std.regex;
import std.stdio;
import std.string;
 
string rev(string s)
{
    return s.split("").reverse.join;
}
 
BigInt[] NearestPalindromeNumbers(BigInt n)
{
    string s = toDecimalString(n);
    if (s.match(regex("^10+$"))) return [n - 1, n + 1];
 
    long j = s.length / 2;
    long i = s.length - j;
    string a = s[0..i];
    string b = a[0..j].rev;
    BigInt x = BigInt(a ~ b);
    if (x == n) return [x];
 
    a = toDecimalString(BigInt(a) + (x < n ? 1 : -1));
    b = a[0..j].rev;
    BigInt y = BigInt(a ~ b);
    BigInt d = abs(x - n) - abs(y - n);
    if (d < 0) return [x];
    if (d > 0) return [y];
    return x < y ? [x, y] : [y, x];
} 
 
BigInt[] q = [0, 5, 17, 100, 2024, BigInt("12345679042654321"), BigInt("31415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989")];
 
void main()
{
    foreach (n; q) writeln(NearestPalindromeNumbers(n));
}

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