public static void Main()
char a = char.Parse(Console.ReadLine());
char b = char.Parse(Console.ReadLine());
char c = char.Parse(Console.ReadLine());
for (char i1 = a; i1 <= b; i1++)
for (char i2 = a; i2 <= b; i2++)
for (char i3 = a; i3 <= b; i3++)
if(i1 != c && i2 != c && i3 != c)
Console.Write("{0}{1}{2} ",i1,i2,i3);