def name(params):
    aho = 0
    P = ""
    alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    
    while aho < len(params):
        P=f"{P}{alpha[((alpha.index(params[aho])+13)%26)]}"
        aho += 1
    return P
print(name("PUVT"))
print('Hello world!')