#include <stdio.h>
#include <string.h>

int main(int argc, char* argv[])
{
	// 39

	char c_target[10] = "";
	scanf("%s", c_target);

	char c_maxNum = '1';
	int maxSuffix = 0;
	for (int len = 0; len < strlen(c_target); len++) {
		c_maxNum = '1';
		maxSuffix = 0;
		for (int nlen = len; nlen < strlen(c_target); nlen++) {
			if (c_maxNum <= c_target[nlen]) {
				c_maxNum = c_target[nlen];
				maxSuffix = nlen;
			}
		}

		if (c_target[len] < c_maxNum) {
			c_target[maxSuffix] = c_target[len];
			c_target[len] = c_maxNum;
			break;
		}
	}

	printf("%s\n", c_target);

	return 0;
}