include <stdio.h> include <stdlib.h> include <string.h> char change(char s[]){ int n=0,m=0,i; int x; x=strlen(s); for(i=0;i<=x;i++){ if(s[i]=='a') n++; else s[m++]=s[i]; } while(n--) s[m++]='a'; return s;}int main(int argc, char *argv[]) { char s[900],s1; scanf("%s",&s); s1=...