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import std.algorithm;
import std.array;
import std.conv;
import std.stdio;

int main(string[] args)
{
    int n;
    byte[] number;
    byte[] twice;

    do
    {
        ++n;
        number = cast(byte[])n.to!(char[]);
        twice = cast(byte[])(n * 2).to!(char[]);
    }
    while (number.sort() != twice.sort());

    writeln(n);

    return 0;
}