/*
* C++11 code template for contests.
* @author: Andrei Kalendarov
* @e-mail: andreykalendarov@gmail.com
*/

//#define ANDREIKKAA_ALLOCATOR
const int _ML = 400;

const char _inpf[] =
#if defined(ANDREIKKAA)
        "input.txt"
#else
""
#endif
;
const char _outf[] =
#if defined(ANDREIKKAA)
        ""
#else
""
#endif
;

#if defined(ANDREIKKAA)
#undef NDEBUG
#else
#pragma GCC optimize("O3,no-stack-protector")
#endif
#include <bits/stdc++.h>
#if !defined(ANDREIKKAA)
#define endl '\n'
#endif
#define x first
#define y second
using namespace std;
#define rand abcdefghijklmnopqrstuvwxyz
#define random_shuffle abcdefghijklmnopqrstuvwxyz
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
typedef long long ll;
typedef double ld;
const ld PI = 3.14159265358979323846;
mt19937 rd(228);
#if defined(ANDREIKKAA_ALLOCATOR)
char _mem[_ML * 1024 * 1024];
size_t _ptr = 0;
inline void* operator new (size_t _x) { _ptr += _x; assert(_ptr < _ML * 1024 * 1024); return _mem + _ptr - _x; }
inline void operator delete (void*) { }
#endif
template<class T, class U> inline ostream &operator<< (ostream &, const pair<T, U> &);
template<class T, class U> inline istream &operator>> (istream &, pair<T, U> &);
template<class T> inline ostream &operator<< (ostream &, const vector<T> &);
template<class T> inline istream &operator>> (istream &, vector<T> &);
template<class T> inline ostream &operator<< (ostream &, const set<T> &);
template<class T> inline ostream &operator<< (ostream &, const multiset<T> &);
template<class T> inline ostream &operator<< (ostream &, const unordered_set<T> &);
template<class T> inline ostream &operator<< (ostream &, const unordered_multiset<T> &);
template<class T, class U> inline ostream &operator<< (ostream &, const map<T, U> &);
template<class T, class U> inline ostream &operator<< (ostream &, const unordered_map<T, U> &);

/* ________ CODE ________ */

inline void _main_function()
{
    string s;
    cin >> s;
    
    if(sz(s) == 26)
    {
        string was = s;
        if(next_permutation(all(s)))
        {
            for(;;)
            {
                string t = s;
                t.pop_back();
                if(t < was)
                {
                    break;
                }
                s = t;
            }
            cout << s << endl;
        }
        else
        {
            cout << -1 << endl;
        }
    }
    else
    {
        vector<bool> u(26);
        for(char c : s)
        {
            u[c - 'a'] = true;
        }
        
        for(int i = 0; i < 26; ++i)
        {
            if(!u[i])
            {
                s += 'a' + i;
                break;
            }
        }
    
        cout << s << endl;
    }
}

/* ________ CODE ________ */

int main()
{
#if defined(ANDREIKKAA)
    time_t _start = clock();
#endif
    if (_inpf[0] != '\0') assert(freopen(_inpf, "r", stdin) != nullptr);
    if (_outf[0] != '\0') assert(freopen(_outf, "w", stdout) != nullptr);
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    cout << setprecision(20);
    //cout << fixed;
    
    _main_function();
#if defined(ANDREIKKAA)
    cout << "Time: " << (clock() - _start) / (ld)CLOCKS_PER_SEC << endl;
#endif
}

template<class T, class U> inline ostream &operator<< (ostream &_out, const pair<T, U> &_p)
{
    _out << _p.x << ' ' << _p.y;
    return _out;
}
template<class T, class U> inline istream &operator>> (istream &_in, pair<T, U> &_p)
{
    _in >> _p.x >> _p.y;
    return _in;
}
template<class T> inline ostream &operator<< (ostream &_out, const vector<T> &_v)
{
    if (_v.empty()) { return _out; }
    _out << *_v.begin();
    for (auto _it = ++_v.begin(); _it != _v.end(); ++_it) { _out << ' ' << *_it; }
    return _out;
}
template<class T> inline istream &operator>> (istream &_in, vector<T> &_v)
{
    for (auto &_i : _v) { _in >> _i; }
    return _in;
}
template<class T> inline ostream &operator<< (ostream &_out, const set<T> &_s)
{
    if (_s.empty()) { return _out; }
    _out << *_s.begin();
    for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; }
    return _out;
}
template<class T> inline ostream &operator<< (ostream &_out, const multiset<T> &_s)
{
    if (_s.empty()) { return _out; }
    _out << *_s.begin();
    for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; }
    return _out;
}
template<class T> inline ostream &operator<< (ostream &_out, const unordered_set<T> &_s)
{
    if (_s.empty()) { return _out; }
    _out << *_s.begin();
    for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; }
    return _out;
}
template<class T> inline ostream &operator<< (ostream &_out, const unordered_multiset<T> &_s)
{
    if (_s.empty()) { return _out; }
    _out << *_s.begin();
    for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; }
    return _out;
}
template<class T, class U> inline ostream &operator<< (ostream &_out, const map<T, U> &_m)
{
    if (_m.empty()) { return _out; }
    _out << '(' << _m.begin()->x << ": " << _m.begin()->y << ')';
    for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->x << ": " << _it->y << ')'; }
    return _out;
}
template<class T, class U> inline ostream &operator<< (ostream &_out, const unordered_map<T, U> &_m)
{
    if (_m.empty()) { return _out; }
    _out << '(' << _m.begin()->x << ": " << _m.begin()->y << ')';
    for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->x << ": " << _it->y << ')'; }
    return _out;
}

Measured memory_bytes: 256