#include <stdio.h>
#include <string.h>

int main(int argc, char** argv) {
  char* p = argv[1]; //get the first argument
  char* q = p + strlen(p) - 1;
  char t;

  while(*p != 'A') {
    p++;
  }
  while(*q != 'A') {
    q--;
  }
  while(p < q){
      t = *p;
      *p = *q;
      *q = t;
      printf("%c - %c: %s\n",*p,*q,argv[1]);
      p++;
      q--;
  }
  /* printf("%s",q); */ 
  return (q - argv[1]);
}