#include<stdio.h>
#include<string.h>
int main()
{
int i,j,n;
char s[20],temp;
scanf("%s",s);
n=strlen(s)-1;
/*---BUBBLE SORT---*/
for(i=0; i<n; i++)
for(j=0;j<n-i;j++)
if(s[j]>=s[j+1])
{
temp = s[j];
s[j] = s[j+1];
s[j+1] = temp;
}
printf("%s",s);
return 0;
}
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