#include<iostream>
using namespace std;
string s;
int cnt[10];
main()
{
	cin>>s;
	for(int i=0;i<s.size();i++)cnt[s[i]-'0']++;
	if(cnt[0]+1==s.size()||cnt[s[0]-'0']==s.size())
	{
		cout<<-1<<endl;
		return 0;
	}
	string out="";
	for(int i=9;i>=0;i--)
	{
		out+=string(cnt[i],'0'+i);
	}
	int id=out.size()-1;
	while(out[id]==out.back())id--;
	char c=out[id+1];
	out[id+1]=out[id];
	out[id]=c;
	cout<<out<<endl;
}