const solution = (number, k) => {
const stack = [];
let answer = '';
for (let i = 0; i < number.length; i++){
const el = number[i];
while(k > 0 && stack[stack.length-1] < el){
stack.pop();
k--;
}
stack.push(el);
}
stack.splice(stack.length-k, k);
answer = stack.join("");
return answer;
}