private void txtInput_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key < Key.A || e.Key > Key.Z)
{
e.Handled = true;
return;
}
char key = e.Key.ToString()[0];
MoveRotors();
UpdateOffsetLabel();
char output = GetPlugboardTrans(rightRotor.GetInput(GetPlugboardTrans(key)));
txtOutput.Text += output;
txtInput.CharacterCasing = CharacterCasing.Upper;
}