#include <iostream>
#include <utility>
using namespace std;

int main()
{
	char s[10];
	cin >> s;

	for ( char* pl = s; *pl != '\0'; pl++ ) {
		char* pr = pl;
		for ( char* p = pl + 1; *p != '\0'; p++ ) {
			if ( *p >= *pr ) {
				pr = p;
			}
		}
		if ( pr != pl ) {
			swap(*pl, *pr);
			break;
		}
	}

	cout << s << endl;

	return 0;
}