Building

function building(input) {
  //Input
  let floors = Number(input.shift());
  let rooms = Number(input.shift());

  //Code
  let str = '';

  for (let f = floors; f > 0; f--) {
    if(f == floors) {
      //First
      for (let i = 0; i < rooms; i++) {
        str += `L${f}${i} `;
      }
    } else if (f % 2 == 0) {
      //Even
      for (let i = 0; i < rooms; i++) {
        str += `O${f}${i} `;
      }
    } else {
      //Odd
      for (let i = 0; i < rooms; i++) {
        str += `A${f}${i} `;
      }
    }
  console.log(str);
  str = '';
  }
}