#include <stdio.h>
  #include <stdlib.h>

  int main() {
    char *s = "world";

    s[0] = 'o';
    s[1] = 'w';
    s[2] = 'n';
    s[3] = 'e';
    s[4] = 'd';

    printf("Hello, %s\n", s);
  }