/*
yukicoder No.39
作成者：ヒロソフ
使用言語：C/C++
*/
#include <stdio.h>
#include <string.h>
int StringToInt(char *pszString);
void Swap(char *p1, char *p2);
int main(void) {
	char NumberStr[10];

	scanf("%s", NumberStr);

	int Num = StringToInt(NumberStr);
	int b_Num;
	int length = strlen(NumberStr);

	for (int i = 0; i < length - 1 ; i++) {
		for (int j = i + 1; j < length; j++) {

			Swap(NumberStr + i, NumberStr + j);
			b_Num = StringToInt(NumberStr);
			if (Num < b_Num) Num = b_Num;
			Swap(NumberStr + i, NumberStr + j);

		}
	}

	printf("%d\n", Num);
	return 0;
}

void Swap(char *p1, char *p2) {
	char b = *p1;
	*p1 = *p2;
	*p2 = b;
}

int StringToInt(char *pszString) {
	int no = 0;
	char *pc = pszString;
	while (*pc) {
		no = no * 10 + (9 - ('9' - *pc));
		pc++;
	}
	return no;
}