public void FindContest()
{
var filter = IO.GetFilter();
var idx = 0;
var nextContestIndex = NextContest(filter, idx);
do
{
var contestIdx = nextContestIndex.GetAwaiter().GetResult();
if (contestIdx == -1)
{
IO.NotFound();
Environment.Exit(1);
}
idx = contestIdx + 1;
IO.DisplayContest(_contests[contestIdx]);
nextContestIndex = NextContest(filter, idx);
} while(IO.AnotherContest());
}