C# Magic Letter - Second Solution
namespace RevisonSomething
{
using System;
public class Program
{
static void Main()
{
char firstLetter = char.Parse(Console.ReadLine());
char secondLetter = char.Parse(Console.ReadLine());
string skipLetter = Console.ReadLine();
for (char i = firstLetter; i <= secondLetter; i++)
{
for (char j = firstLetter; j <= secondLetter; j++)
{
for (char k = firstLetter; k <= secondLetter; k++)
{
string input = $"{i}{j}{k} ";
if (!input.Contains(skipLetter))
{
Console.Write(input);
}
}
}
}
}
}
}
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