#include <stdio.h>

int main(void)
{
	char n[11],i,j,tmp;
	int a,b;
	scanf("%s",n);

	for (i=0;i<9;i++) {
		a = n[i] - '0';
		for (j=8;j>i;j--) {
			if (n[j] < '0' || n[j] > '9') continue;
			b = n[j] - '0';
			if (a < b) {
				tmp = n[i];
				n[i] = n[j];
				n[j] = tmp;
				printf("%s\n",n);
				return 0;
			}
		}
	}
	printf("%s\n",n);
		
	return 0;
}