#include <stdio.h>

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

	for (i=0;i<9;i++) {
		max = -1;
		for (j=8;j>i;j--) {
			if (n[j] < '0' || n[j] > '9') continue;
			if (max < n[j]) {
				max = n[j];
				maxNum = j;
			}
		}
		
		if (n[i] < max) {
			tmp = n[i];
			n[i] = n[maxNum];
			n[maxNum] = tmp;
			printf("%s\n",n);
			return 0;
		}
	}
	printf("%s\n",n);
		
	return 0;
}