Angular cli is not working

currently i am learning angular4 . So for this i install node js , then i do the following command in Node js commend prompt

npm install -g typescript
npm install -g @angular/cli@1.0.0
ng new --ng4 angullar-hello-world

By doing this , i created a angular project . Then for run project i type

ng serve

now the project run successfully http://localhost:4200

and in nod js command prompt the message is webpack: compiled successfully . But after this i cannot type anything in command prompt . Command prompt and project is still working good , but i cannot type any word or command . I am using windows 8 & Node v6.10.2 LTS .

Please any one can help

via abilash er