Building JS 100/100

function building(input) {
    let floor = Number(input[0]);
    let rooms = Number(input[1]);

    for (let i = floor; i > 0; i--) {
        let buff = "";
        for (let j = 0; j < rooms; j++) {
            if (i === floor) {
            buff += `L${i}${j} `;
            } else if (i % 2 === 0) {
                buff += `O${i}${j} `;
            } else {
                buff += `A${i}${j} `;
            }
        }
        console.log(`${buff}`);
    }
}