import std.algorithm, std.array, std.container, std.range;
import std.string, std.conv, std.math;
import std.stdio, std.typecons;

void main()
{
  auto n = readln.chomp;
  auto max = n.dup;

  foreach (i; 0..(n.length - 1))
    foreach (j; (i + 1)..n.length) {
      auto m = n.dup;
      swap(m[i], m[j]);
      if (m > max)
        max = m;
    }
  
  writeln(max);
}