/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
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
	{
		List<Integer> numbers = new ArrayList<>();
 
		numbers.add(5);
		numbers.add(6);
		numbers.add(7);
		numbers.add(8);
 
		String value = numbers.stream().map(Object::toString).collect(Collectors.joining("-"));
		System.out.println(value);
	}
}

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