#include <bits/stdc++.h>  

using namespace std;

//#define int long long
#define FOR(i, j, k) for(int i = j; i < k; ++i)
#define rep(i, j) FOR(i, 0, j)
#define FORr(i, j, k) for(int i = j; i >= k; --i)
#define repr(i, j) FORr(i, j, 0)
#define INF (1 << 30)

typedef unsigned long long ull;
typedef pair<int, int> P;
typedef pair<P, int> Pi;

const int MOD = 1e9 + 7;
const int dy[] = {0, 0, 1, -1};
const int dx[] = {1, -1, 0, 0};

template <class T> void chmin(T& a, const T& b) { a = min(a, b); }
template <class T> void chmax(T& a, const T& b) { a = max(a, b); }

signed main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    string s;
    cin >> s;
    rep(i, s.size()) {
        int cha = i;
        for(int j = s.size() - 1; j > i; --j) {
            if(s[cha] < s[j]) {
                cha = j;
            }
        }
        if(cha != i) {
            swap(s[i], s[cha]);
            cout << s << endl;
            return 0;
        }
    }
    cout << s << endl;
    return 0;
}