A push B present C push D present E怎么返回A

RT。A，B，C，D，E为五个控制器。A push B present C push D present E怎么返回A

1 [[UIApplication sharedApplication].keyWindow.rootViewController dismissViewControllerAnimated:NO completion:^{
2         [((UINavigationController *)[UIApplication sharedApplication].keyWindow.rootViewController) popToRootViewControllerAnimated:NO];
3     }];