1.) Z
2.)F
3.)P
4.)W
All letters have rotational symmetry if you allow a rotation of 360o.
The only letter in that group of have a rotation less than 360o is the letter Z, which has rotational symmetry of 180o.
Here is a you tube clip on roatational symetry :)
https://www.youtube.com/watch?v=UzMa6GnMnzg