ThePianist

function solve(input){
    let n= Number(input.shift());

  let AllPieces={};
     for (let i = 0; i < n; i++) {

        let CommandLine=input.shift();
        let ArrLine1= CommandLine.split('|');
        let piece=ArrLine1[0];
        let composer=ArrLine1[1];
        let key=ArrLine1[2];
        AllPieces[piece]= {composer,key};

     }


     let CommandLine1=input.shift();
    while(CommandLine1 != 'Stop'){
       let ArrLine= CommandLine1.split('|');
       let piece=ArrLine[1];
       switch(ArrLine[0]){
        case'Add':

        const composer=ArrLine[2];
        const key=ArrLine[3];

         if( AllPieces[piece] ==null){

        AllPieces[piece] ={composer,key};
        console.log(`${piece} by ${composer} in ${key} added to the collection!`)
       }
       else{
        console.log(`${piece} is already in the collection!`)
       }
        break;
        case'Remove':


       if( AllPieces[piece] != null){
        delete  AllPieces[piece];
        console.log(`Successfully removed ${piece}!`)
       }
       else{console.log(`Invalid operation! ${piece} does not exist in the collection.`)

       }
       break;
        case'ChangeKey':
        let newkey=ArrLine[2];
        if( AllPieces[piece] != null){
            AllPieces[piece].key= newkey;
            console.log(`Changed the key of ${piece} to ${newkey}!`)
        }
        else{
            console.log(`Invalid operation! ${piece} does not exist in the collection.`);
        }
          break;

       }
        CommandLine1=input.shift();
    }



    for (const piece in AllPieces) {
       console.log(`${piece} -> Composer: ${AllPieces[piece].composer}, Key: ${AllPieces[piece].key}`)
    }
}



solve([
    '3',
    'Fur Elise|Beethoven|A Minor',
    'Moonlight Sonata|Beethoven|C# Minor',
    'Clair de Lune|Debussy|C# Minor',
    'Add|Sonata No.2|Chopin|B Minor',
    'Add|Hungarian Rhapsody No.2|Liszt|C# Minor',
    'Add|Fur Elise|Beethoven|C# Minor',
    'Remove|Clair de Lune',
    'ChangeKey|Moonlight Sonata|C# Major',
    'Stop'
  ]
  )