how to decrypt this code

Question

I have worked on it for 4 hrs,could someone tell me how to solve it or tell me what cryptosystem being used?The problem are as following:
 ZJUKB OLARJ UMPHV YBTDP NXLZX HLMFU MBOQH KECJR HICPR HPYVY LPNNS LQLNE RNSKR SNBUG ZLFWN BCCZZ ZTALV UVZVN OZNIL

only the characters are given without any hints.I am just a beginner.