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What will be the output of the program?

#include 

 int main() 
 {   
     struct s1  
     {       
         char *z;    
      int i;   
      struct s1 *p;    
      }; 
      static struct s1 a[] = {{"Nagpur", 1, a+1} , {"Chennai", 2, a+2} ,                              {"Bangalore", 3, a} }; 
     struct s1 *ptr = a;       
     printf("%s,", ++(ptr->z));     
     printf(" %s,", a[(++ptr)->i].z);     
     printf(" %s", a[--(ptr->p->i)].z); 
     return 0; 
 }