#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;

#define PI         acos(-1.0)
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)

typedef long long ll;

ll calc(vector<int> v){
    ll ret = 0;
    FOR(i,0,v.size()){
        ret *= 10;
        ret += v[i];
    }
    return ret;
}

int main(){
    ll n;
    cin >> n;
    vector<int> v;
    while(n>0){
        v.push_back(n%10);
        n /= 10;
    }
    reverse(v.begin(), v.end());
    int len = v.size();
    ll MAX = 0;
    FOR(i,0,len){
        FOR(j,0,len){
            swap(v[i], v[j]);
            MAX = max(MAX, calc(v));
            swap(v[i], v[j]);
        }
    }
    cout << MAX << endl;
    return 0;
}