#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<strings.h>
using namespace std;
#define LL long long
int main(){
	string s;
	cin>>s;
	int n=(int)s.size();
	LL res=atoll(s.c_str());
	for(int i=0;i<n;i++)
		for(int j=i+1;j<n;j++){
			swap(s[i],s[j]);
			res=max(res,atoll(s.c_str()));
			swap(s[i],s[j]);
		}
	cout<<res<<endl;
}