// Too simple to consider use of IO template
static int[] Run(int[] a, int[] b)
{
var demo = new SubseqAlgoDemo <char>();
var a = Console.ReadLine().ToCharArray();
var b = Console.ReadLine().ToCharArray();
Console.WriteLine(new string(demo.LongestCommonSubsequence(b, a)));
}
// IO method's in 'general-solving/hackerrank/IOTemplate.cs'
static int[] Run(int[] a, int[] b)
{
var demo = new SubseqAlgoDemo <int>();
return(demo.LongestCommonSubsequence(a, b));
}