Envío 4512

Código

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		String inputX = sc.nextLine();
		StringBuilder X = new StringBuilder();
		X.append(inputX);
		X.reverse();
		
		String inputY = sc.nextLine();
		StringBuilder Y = new StringBuilder();
		Y.append(inputY);
		Y.reverse();
		
		StringBuilder result = new StringBuilder();
		int sumResult = 0;
		int maxSize = Integer.max(inputX.length(), inputY.length());
		for (int position = 0; position < maxSize; position++) {
			if (position < inputX.length()) {
				sumResult += Integer.parseInt(X.substring(position, position + 1));
			} 
			if (position < inputY.length()) {
				sumResult += Integer.parseInt(Y.substring(position, position + 1));
			} 
			result.append(sumResult % 10);
			sumResult = sumResult / 10;
		}
		
		if (sumResult == 1){
			result.append(1);
		}

		sc.close();
		System.out.println(result.reverse());
	}
}