/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String str = "1 , 2, 2a, 3,    14, b55";
List<Integer> list =  Arrays.stream(str.split(","))
                            .map(String::trim)
                            .filter(s -> s.matches("\\d+"))
                            .map(Integer::valueOf)
                            .collect(Collectors.toList());
System.out.println(list);  
	}
}

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