static IEnumerable<KeyValue<char, int>> CountSymbols(string text)
{
var counter = new MyDictionary<char, int>();
foreach (var character in text)
{
int sequence = 0;
if (counter.ContainsKey(character))
{
sequence = counter.Get(character);
}
counter.AddOrReplace(character, ++sequence);
}
return counter;
}