public static void Main(String[] args)
{
ACGT aCGT = new ACGT();
String input = Console.ReadLine();
do
{
var inputParts = input.Split('|');
int maxPeriod = int.Parse(inputParts[0]);
string[] acgt = inputParts[1].Split(',');
Console.WriteLine(aCGT.MinChanges(maxPeriod, acgt));
input = Console.ReadLine();
} while (input != "-1");
}
public static void Solve()
{
var S = Scanner.Scan <string>();
const string ACGT = "ACGT";
var answer = 0;
var count = 0;
for (var i = 0; i < S.Length; i++)
{
if (ACGT.Contains(S[i]))
{
count++;
}
else
{
count = 0;
}
answer = Math.Max(answer, count);
}
Console.WriteLine(answer);
}
