#include using namespace std; using uint = unsigned int; using ll = long long; using ull = unsigned long long; template using V = vector; template using VV = V>; template using VVV = V>; template using VVVV = VV>; #define rep(i,n) for(ll i=0ll;i void chmin(T& t, const U& u) { if (t > u) t = u; } template void chmax(T& t, const U& u) { if (t < u) t = u; } // cin.tie(nullptr); // ios::sync_with_stdio(false); // cout << fixed << setprecision(20); void solve(){ string s; cin >> s; sort(be(s)); ll n=s.size(); if(s[0] == s[n-1]){ cout << -1 << endl; return; } rep(i, n-1) if(s[i]!=s[i+1]){ swap(s[i], s[i+1]); break; } reverse(be(s)); if(s[0] == '0') cout << -1 << endl; else cout << s << endl; } int main(){ cin.tie(nullptr); ios::sync_with_stdio(false); int t=1; // cin >> t; rep(i,t) solve(); }