Random Generator HPB

hrng.sol

pragma solidity ^0.5.6;

contract HRNG {
   function getRandom() public view returns (bytes32) {
      return block.random;
   }
}

retrieverandom.sol

// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.4;

abstract contract HRNG {
   function getRandom() public view virtual returns (bytes32);
}

contract RetrieveRandom {
    address hrngAddr;
    HRNG hrng;
    
    constructor (address hrngaddr) {
        hrngAddr = hrngaddr;
        hrng = HRNG(hrngAddr);
    }

    function retrieveNumber() public view returns (uint256) {
        uint256 random = uint256(hrng.getRandom());
        return random;
    }
}