//字符串中找出连续最长的数字串

import java.util.Scanner;
//字符串中找出连续最长的数字串
public class Main_831 {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);while (scanner.hasNext()) {String str = scanner.nextLine();String[] numArr = str.split("[^0-9]+");int max = 0;String res = "";for (int i = 0; i < numArr.length; i++) {int len = numArr[i].length();if (len > max) {res = numArr[i];max = len;}}System.out.println(res);}scanner.close();}
}