#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>

using namespace std;

#define INF 		2000000007
#define MOD			1000003

#define MAX 		105

#define REP(i,n)	for(int i=0;i<(n);++i)
#define REPS(i,s,t)	for(int i=(s);i<(t);++i)

typedef unsigned int 			uint;
typedef unsigned long long int	ull;

int index(vector<int> &array,int s){
	for (int i=0;i<array.size();++i)
		if(array[i] == s)
			return i;
	return -1;
}

int main(){
	string str;cin >> str;

	vector<int> a,b;

	REP(i,str.size())
		a.push_back(str[i]-'0');
	b = a;
	sort(a.begin(),a.end(),greater<int>());

	for(int i=0;i<str.size();++i){
		if(a[i] != b[i]){
			int tmp = index(b,a[i]);
			swap(b[i],b[tmp]);
			break;
		}
	}//*/
	
	for(int t:b)
		cout << t;
	cout << endl;

	return 0;
}