function missingNumbers(arr: number[], brr: number[]): number[] {
    arr.forEach((a) => {
        const index = brr.indexOf(a);
        if(index > -1){
            brr.splice(index, 1)
        }
    })
    const isUnique = Array.from(new Set(brr));
    
    return isUnique.sort((a, b) => a-b);
}