import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String s = "Doc201810011052053_fotoAssicurazioneCartaceo_3962128_943000.jpg";
		Pattern rexExp = Pattern.compile("_(\\w+)_\\d+_\\d+\\.[^.]*$");
		Matcher matcher = rexExp.matcher(s);
		if (matcher.find()){
			System.out.println(matcher.group(1)); 
		} 
	}
}