/**
  @file 0927.cpp
  @title  No.927 Second Permutation - yukicoder
  @url https://yukicoder.me/problems/no/927
**/

#include <bits/stdc++.h>
using namespace std;

typedef long long LL;
typedef unsigned long long uLL;
typedef unsigned int uint;

#define ALL(obj) (obj).begin(), (obj).end()
#define RALL(x) (x).rbegin(), (x).rend()
#define SZ(x) ((int)(x).size())

#define REPI(i, a, b) for (LL i = LL(a); i < LL(b); ++i)
#define REP(i, N) for (LL i = LL(0); i < LL(N); ++i)
#define REPS(i, N) for (int i = 1; i <= (int)(N); i++)
#define RREP(i, N) for (int i = ((int)(N)-1); i >= 0; i--)
#define RREPS(i, N) for (int i = ((int)(N)); i > 0; i--)

#define chmax(ret, x) ret = max(ret, x)
#define chmin(ret, x) ret = min(ret, x)

#define FILL(x, e) memset(x, e, sizeof(x))
#define ZEROS(x) fill(x, 0)

#define SORT(x) sort(ALL(x))
#define RSORT(x) sort(RALL(x))

#define UNIQ(x) x.erase(unique(ALL(x)), x.end())

#define BIT(n) (1LL << (n))

#define OUT(x) cout << (x) << "\n"
#define DEBUG(x) cerr << #x << "\t: " << x << "\n"
#define DEBUG2(x, y) cerr << "(" << #x << ", " << #y << ") = (" << x << ", " << y << ")\n";

#define PB push_back
#define EB emplace_back
#define MP make_pair
#define MT make_tuple
#define FI first
#define SE second

const int MOD = 1e9 + 7;

void iostream_init() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.setf(ios::fixed);
  cout.precision(12);
  // cout.fill('0');
  // cout.width(3);
}

int main() {
  ::iostream_init();

  string S;
  cin >> S;

  string tmpS = S;
  SORT(tmpS);
  UNIQ(tmpS);

  if (SZ(tmpS) >= 2) {
    string first  = tmpS.substr(0, 1);
    string second = tmpS.substr(1, 1);
    // DEBUG(first);
    // DEBUG(second);

    RSORT(S);
    int idx1st = S.find(first);
    int idx2nd = S.rfind(second);
    // DEBUG(idx1st);
    // DEBUG(idx2nd);
    S.replace(idx1st, 1, second);
    S.replace(idx2nd, 1, first);
  }

  if (S[0] != '0' && SZ(tmpS) != 1) {
    OUT(S);
  } else {
    OUT("-1");
  }

  return 0;
}