using System;
using System.Collections.Generic;
class Program
{
static void Main()
{
List<string> source = new List<string> { "aaa", "bbb", "ccc" };
List<string> target = new List<string> { "ddd" };
if (source.Count > 0) {
target.Add(source[0]); // Add the first element of source to target
}
Console.WriteLine(string.Join(", ", target));
}
}
/*
run:
ddd, aaa
*/