// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Simple {
    function input(uint _a, uint) public{
        // do something with _a.
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Simple {
    function output(uint256 _a, uint256 _b)
        public
        pure
        returns (uint256, uint256)
    {
        uint256 x = _a + _b;
        uint256 y = _a * _b;
        return (x, y);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Simple {
    function output(uint _a, uint _b) public pure returns (uint x, uint y) {
        x = _a + _b;
        y = _a * _b;
    }
}