using
System;using
System.Collections.Generic;using
System.Text;
namespace
ConsoleApplication1{
class Program{
static void Main(string[] args){
Random r = new Random(); char ch; int a; for (int k = 0; k < 20; k++){
for (int i = 0; i < 4; i++){
a = r.Next(65, 91);
ch =
Convert.ToChar(a); Console.Write("{0}", ch);}
Console.WriteLine();}
Console.ReadLine();}
}
}
