import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
String[] split = s.split("[^0-9]");
String tmp = "";
for (int i = 0; i < split.length; i++){
if (tmp.length() < split[i].length()){
tmp = split[i];
}
}
System.out.println(tmp);
}
}



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