#include <algorithm> #include <cfloat> #include <climits> #include <cmath> #include <complex> #include <cstdio> #include <cstdlib> #include <cstring> #include <functional> #include <iostream> #include <map> #include <memory> #include <queue> #include <set> #include <sstream> #include <stack> #include <string> #include <utility> #include <vector> using namespace std; typedef long long ll; #define sz size() #define pb push_back #define mp make_pair #define fi first #define se second #define all(c) (c).begin(), (c).end() #define rep(i,a,b) for(ll i=(a);i<(b);++i) #define per(i,a,b) for(ll i=b-1LL;i>=(a);--i) #define clr(a, b) memset((a), (b) ,sizeof(a)) #define ctos(c) string(1,c) #define print(x) cout<<#x<<" = "<<x<<endl; #define MOD 1000000007 int main(){ string s; cin>>s; sort(all(s)); set<string> se; do{ if(s[0]!='0'){ se.insert(s); } }while(next_permutation(all(s))); if(se.sz<=1){ cout << -1 << endl; } else{ vector<string> v(all(se)); cout << v[v.sz-2] << endl; } return 0; }