N=input()
if N[-1] == 2 :
    print("hon")
elif N[-1] == 4 :
    print("hon")
elif N[-1] == 5 :
    print("hon")
elif N[-1] == 7 :
    print("hon")
elif N[-1] == 9 :
    print("hon")
elif N[-1] == 1 :
    print("pon")
elif N[-1] == 6 :
    print("pon")
elif N[-1] == 8 :
    print("pon")
else :
    print("bon")