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

void main(){
  auto N = readln().strip().to!string().array();
  dchar[] sorted = N.dup;
  auto ind = iota(0, N.length).array();

  sorted.sort!("a > b")();

  int i = 0;
  while(i < N.length && N[i] == sorted[i]) ++i;

  int p;

  if ( i != N.length ) {
    foreach_reverse(immutable int j; 0 .. N.length.to!int){
      if(sorted[i] == N[j]) {
        p = j;
        break;
      }
    }
    swap(N[i], N[p]);
  }

  writeln(N);
  return;
}