Envío 3333

Código

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sn = new Scanner(System.in);
        String number = sn.nextLine();
        Integer carry = sn.nextInt();
        List<Long> longNumber = new ArrayList<>();
        for (int i = 0; i < number.length(); i++) {
            longNumber.add(Long.parseLong(Character.toString(number.charAt(i))));
        }
        for (int i = longNumber.size() - 1; i >= 0 && carry > 0; i--) {
            var current = longNumber.get(i) + carry;
            longNumber.set(i, current % 10);
            carry = Math.round(current / 10);
        }

        if (carry > 0) {
            longNumber.add(0, 1L);
        }
        longNumber.stream().forEach((i) -> System.out.print(i));
    }

}