using System;
using System.Linq;
class Program
{
static bool contain_same_characters_and_order(string s1, string s2) {
string s1_tmp = new string(s1.ToCharArray().Distinct().ToArray());
string s2_tmp = new string(s2.ToCharArray().Distinct().ToArray());
return s1_tmp == s2_tmp;
}
static void Main() {
string s1 = "c# programming";
string s2 = "c#### ppprooooooogramminggg";
if (contain_same_characters_and_order(s1, s2))
Console.Write("yes");
else
Console.Write("no");
}
}
/*
run:
yes
*/