function phoneBook(input){
  let mybook = [];
  let newbook = []
      input.forEach(line => {

          let [name,phone] = line.split(" ");
          let book = {
              [name]: phone,
          }

          mybook.push(book);
      });

      for(let element of mybook) {
    let el=  Object.entries(element)
    newbook.push(el)
      }
      newbook.sort((a,b) => a[0][0].localeCompare(b[0][0])).map(a=>  console.log(`${a[0][0]}`))