#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include // #include using namespace std; using ll = long long; using P = pair; constexpr ll INF = 9e18; constexpr int inf = 1e9; const double INFD = 1e100; const ll mod = 1000000007; const double PI = 3.1415926535897932384626433832795028841971; const int dx[4] = {1, 0, -1, 0}; const int dy[4] = {0, 1, 0, -1}; template inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }; template inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }; // intやllをstringに変換 template inline string toString(const T &a){ ostringstream oss; oss << a; return oss.str(); }; // ---------------------------------------------------------------------------- int main(){ string S; cin >> S; if(S == "1"){ cout << -1 << endl; return 0; } if(S[0] != '1'){ cout << -1 << endl; return 0; } for(int i=1; i