/* shellsort.c; cpl3.5 */

#include <stdio.h>
#define MAXLINE 1000

int getline(char s[], int lim);
void shellsort (char v[], int  n);
char line[MAXLINE];

main()
{
	int len;

	while (len = getline(line, MAXLINE)) {
		shellsort(line, len-1); /* don't sort \n */
		printf("%s",line);
	}
}

/* shellsort: sort v[0]...v[n-1] into increasing order */
void shellsort (char v[], int  n)
{
    int gap, i, j, temp;

    for (gap = n/2; gap > 0; gap /= 2)
        for (i = gap; i < n; i++)
            for (j=i-gap; j>=0 && v[j]>v[j+gap]; j-=gap) {
                temp = v[j];
                v[j]= v[j+gap];
                v[j+gap] = temp;
            }
}

/* getline: read a line into s, return length */
int getline(char s[], int lim)
{
	int c, i;

	for (i=0; i<lim-1 && (c=getchar())!=EOF && c!='\n'; i++)
		s[i] = c;
	if (c == '\n')
		s[i++] = c;
	s[i] = '\0';
	return i;
}