[Init] Solved solutions

cs/520A.cs

@@ -0,0 +1,26 @@
+using System;
+
+namespace _520A
+{
+	class Program
+	{
+		static string c = "abcdefghijklmnopqrstuvwxyz";
+		static bool Check(string s)
+		{
+			for (int i = 0; i < 26; i++)
+			{
+				if (s.IndexOf(c[i]) == -1)
+				{
+					return false;
+				}
+			}
+			return true;
+		}
+		static void Main(string[] args)
+		{
+			string s = Console.ReadLine();
+			s = Console.ReadLine().ToLower();
+			Console.WriteLine("{0}", Check(s) ? "YES" : "NO");
+		}
+	}
+}