N = str(input())

if(N[-1]=="3"):
    print("bon")
    
if(N[-1]=="0" or N[-1]=="1" or N[-1]=="6" or N[-1]=="8"):
    print("pon")
    
if(N[-1]=="2" or N[-1]=="4" or N[-1]=="5" or N[-1]=="7" or N[-1]=="9"):
    print("pon")