---

// Форма с: TextBox (textBox4), Button (button4), Label (label4)

private: System::Void button4_Click(System::Object^  sender, System::EventArgs^  e) {
    String^ text = textBox4->Text;
    array<String^>^ words = text->Split(' ', ',');
    int count = 0;
    
    for each (String^ word in words) {
        if (word->ToLower()->Contains("a")) {
            count++;
        }
    }
    
    label4->Text = "Слов с буквой 'а': " + count.ToString() + 
                   "\nВсего слов: " + words->Length.ToString();
}