#include <bits/stdc++.h>

using namespace std;

int main ()
{
	string str,str2;
	cin >> str;
	str2 = str;
	sort ( str2.rbegin () , str2.rend () );
	int memo = -1,memo3;
	char memo2;
	for( size_t i = 0; i < str.size(); i++ )
	{
		if( memo==-1&&str[i] != str2[i] )
		{
			memo = i;
			memo2 = '0' - 1;
			memo3 = i;
		} else
		{
			if( memo2 <= str[i] )
			{
				memo2 = str[i];
				memo3 = i;
			}
		}
	}
	if( memo + 1 )
	{
		swap ( str[memo] , str[memo3] );
	}
	cout << str << endl;
}