    N  = input()
  
  	0 ≦ N ≦ 100 
             
    if (N[-1]) = 2.4.5.9
            
       print "hon"
             
    elif (N[-1]) = 0.4.6.8
           
       print "pon"
             
    elif (N[-1]) = 3 
            
       print "bon"