#include <bits/stdc++.h>

using namespace std;

int main ()
{
	string str;
	cin >> str;
	char a = '9' + 1 , b = '0' - 1;
	int memo , memo2;
	for( int i = 0; i < str.size (); i++ )
	{
		char x = str[i];
		if( b <= x )
		{
			b = x;
			memo2 = i;
		}
	}
	memo = memo2;
	for( size_t i = 0; i < memo2; i++ )
	{
		if( str[i] < b )
		{
			memo = i;
			break;
		}
	}
	swap ( str[memo] , str[memo2] );
	cout << str << endl;

	return 0;
}