# Enter your code here. Read input from STDIN. Print output to STDOUT

def rectOverlap(r1, r2):

# -7 > -3 or 3 < -4 or 8 < -3 or 5 > 6

#print r1[0], r2[2], r1[2], r2[0], r1[1], r2[3], r1[3], r2[1]

if (int(r1[0]) > int(r2[2])) or (int(r1[2]) < int(r2[0])) or (int(r1[1]) < int(r2[3])) or (int(r1[3]) > int(r2[1])):

return "no overlap"

else:

return "overlap"

def main():

#r1 = list(input())

#r2 = list(input())

#r1 = [0,1,1,0]

#r2 = [1,1,2,0]

#r1 = [0,1,3,0]

#r2 = [3,0,2,0]

r1 = raw_input().split(" ")

r2 = raw_input().split(" ")

#print r1, r2

print rectOverlap(r1, r2)

main()