contract IERC721 is IERC165 {
  event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
  event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
  event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

  /**
   * @dev Returns the number of NFTs in `owner`'s account.
   */
  function balanceOf(address owner) public view returns (uint256 balance);

  /**
   * @dev Returns the owner of the NFT specified by `tokenId`.
   */
  function ownerOf(uint256 tokenId) public view returns (address owner);

  /**
   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
   * another (`to`).
   *
   *
   *
   * Requirements:
   * - `from`, `to` cannot be zero.
   * - `tokenId` must be owned by `from`.
   * - If the caller is not `from`, it must be have been allowed to move this
   * NFT by either {approve} or {setApprovalForAll}.
   */
  function safeTransferFrom(address from, address to, uint256 tokenId) public;
  /**
   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
   * another (`to`).
   *
   * Requirements:
   * - If the caller is not `from`, it must be approved to move this NFT by
   * either {approve} or {setApprovalForAll}.
   */
  function transferFrom(address from, address to, uint256 tokenId) public;

  function approve(address to, uint256 tokenId) public;

  function getApproved(uint256 tokenId) public view returns (address operator);

  function setApprovalForAll(address operator, bool _approved) public;

  function isApprovedForAll(address owner, address operator) public view returns (bool);


  function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public;
}
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
function balanceOf(address owner) public view returns (uint256 balance);

/**
 * @dev Returns the number of NFTs in `owner`'s account.
 */