Messaging

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Messaging {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        List<Integer> indexes = new ArrayList<>();
        List<Integer> numbers = Arrays.stream(scanner.nextLine().split(" "))
                .map(Integer::parseInt)
                .collect(Collectors.toList());
        String text = scanner.nextLine();

        for (int i = 0; i < numbers.size(); i++) {
            int element = numbers.get(i);
            int searchIndex = 0;
            while (element > 0) {
                int digit = element % 10;
                element = element / 10;
                searchIndex += digit;
            }
            indexes.add(i, searchIndex);
        }

        StringBuilder result = new StringBuilder();
        StringBuilder textBilder = new StringBuilder();
        for (int i = 0; i < indexes.size(); i++) {
            int position = indexes.get(i);
            if (position > text.length()) {
                position = position - text.length();
            }
            char letter = text.charAt(position);
            result.append(letter);
            for (int j = 0; j < text.length(); j++) {
                if (!(j == position)){
                    textBilder.append(text.charAt(j));
                }
            }
            text = textBilder.toString();
            textBilder.delete(0,textBilder.length());
        }
        System.out.println(result);
    }
}