#include <iostream>
using namespace std;

#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define REP(i, a) for(int i = 0; i < a; i++)
#define scan(x) cin >> x
#define print(x) cout << x << "\n"

int main() {
    fastcin;
    string n; scan(n);
    char max;
    int index;
    REP(i, n.length()-1) {
        max = n[i];
        index = i;
        rep(j, i+1, n.length()) {
            if (index > i && n[j] == max || n[j] > max) {
                max = n[j];
                index = j;
            }
        }
        if (index > i) {
            char tmp = n[i];
            n[i] = max;
            n[index] = tmp;
            break;
        }
    }

    print(n);
    return 0;
}