1 //main.cpp
 2 
 3 #include<stdio.h>
 4 #include<string.h>
 5 int m;
 6 char *s1,*s2;
 7 int main()
 8 {
 9  void change_sort(char *s1,int m,char *s2);
10  int i;
11 
12  gets(s1);
13 
14  scanf("%d",&m);
15  change_sort(s1,m,s2);
16 
17  for(i=0;s2[i]!='\0';i++)
18     printf("%c",s2[i]);
19 
20  return 0;
21 }

 1 //function.cpp
 2 
 3 void change_sort(char *s1,int m,char *s2)
 4 {
 5  int i,j,k=0;
 6  char t;
 7  for(i=m-1,j=0;s1[i]!='\0';i++,j++)
 8   {
 9     s2[j]=s1[i];
10     k+=1;
11   }
12  for(i=0;i<k;i++)
13     for(j=0;j<k-i-1;j++)
14         if(s2[j]>s2[j+1])
15          {
16           t=s2[j];s2[j]=s2[j+1];s2[j+1]=t;
17          }
18 }