static void Main(string[] args)
{
var testName = args[0];
using (var reader = new StreamReader($"{testName}.in"))
using (var writer = new StreamWriter($"{testName}.out"))
{
var count = int.Parse(reader.ReadLine());
for (var caseId = 1; caseId <= count; caseId++)
{
var splitLine = reader.ReadLine().Split(' ');
var pancakes = splitLine[0];
var flipperSize = int.Parse(splitLine[1]);
var flips = new Flipper(flipperSize).CountFlips(pancakes);
writer.WriteLine("Case #{0}: {1}", caseId, flips?.ToString() ?? "IMPOSSIBLE");
writer.Flush();
}
}
}
