using System;
using System.Linq;
using System.Collections.Generic;

public class Test
{
	public static void Main()
	{
		HashSet<string> allWords = new HashSet<string> {
		    "flame", "flaming", "flamingo", "funfair", "unfair"
		};
		
		var query = allWords
		    .Select(word => word.Substring(0, word.Length - 1))
		    .Concat(allWords.Select(word => word.Substring(1, word.Length - 1)))
		    .Where(candidate => allWords.Contains(candidate));
		   
		foreach (string word in query) {
			Console.WriteLine(word);
		}
	}
}