字符串操作

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()) {
            String line = sc.nextLine();
            String[] arr = line.split("[^0-9]+");
            int max = 0;
            String result = "";
            for(int i = 0; i < arr.length; i++) {
                int len = arr[i].length();
                if(len >= max) {
                    result = arr[i];
                    max = len;
                }
            }
            System.out.println(result);
        }
        sc.close();
    }
}