#!/usr/bin/env python
# -*- coding: utf-8 -*-
age1 = int(raw_input("Age de P1 :"))
age2 = int(raw_input("Age de P2 :"))
if ( age1 > age2 ):
  rslt = age1-age2
else:
  rslt = age2-age1

if (rslt >1):
  s="s"
else:
  s=""
print "Différence : %d an%s" % (rslt,s)