import sys
fn1=sys.argv[1]
fn2=sys.argv[2]
dfh1=open(fn1,'r')
dfh2=open(fn2,'r')
line1=dfh1.readline().split()
line2=dfh2.readline().split()
while line1:
	if line1!=line2:
		print line1
		print line2
		print '\n'
	line1=dfh1.readline().split()
	line2=dfh2.readline().split()