#include <stdio.h>
#include <malloc.h>
#include <stdint.h>

char str[60000];
int str_len = 0;

/// <summary>
/// グローバル変数strの中身を入力された文字列で上書きする
/// </summary>
void readString() {
	char c = getchar();
	str_len = 0;

	while (c != '\n') {
		str[str_len] = c;
		c = getchar();
		str_len++;
	}
}

void swap(int* nums,int index1,int index2) {
	int work = nums[index1];
	nums[index1] = nums[index2];
	nums[index2] = work;
}

int main()
{
	readString();
	int* nums;
	int max = -1;
	int index = -1;
	int start = 0;
	nums = (int*)malloc(sizeof(int) * str_len);

	for (int i = 0;i < str_len-1;i++) {
		for (int j = i+1;j < str_len;j++) {
			if (nums[i] < nums[j]) break;
			if (j == str_len - 1) start = i;
		}
	}
	max = -1;
	for (int i = 0;i < str_len;i++) {
		nums[i] = str[i] - '0';

	}
	for (int i = start;i < str_len;i++) {
		if (nums[i] >= max) {
			index = i;
			max = nums[i];
		}
	}
	for (int i = 0;i < index;i++) {
		if (nums[i] < max) {
			swap(nums, i, index);
			break;
		}
	}
	//printf("max = %d index = %d start = %d\n", max, index, start);
	for (int i = 0;i < str_len;i++) {
		printf("%d",nums[i]);
	}
	printf("\n");
}