#include <bits/stdc++.h>
using namespace std;

int main()
{
int i;
int iPos;
int iPos2;
char S[ 12 ];
char C;
char cMax;

	cin >> S;

	cMax = '0';
	i = 0;
	iPos = 0;
	while( ( C = S[ i ] ) != 0 )
	{
		if( cMax <= C )
		{
			iPos = i;
			cMax = C;
		}

		i++;
	}

	for( i = 0; i < iPos; i++ )
	{
		if( cMax > S[ i ] )
		{
			swap( S[ i ], S[ iPos ] );

			break;
		}
	}

	cout << S << endl;

	return 0;
}