puts "0 0"
$>.flush
s=[0,x=gets.to_i]
exit if x==0
puts "100000 0"
$>.flush
e=[100000,x=gets.to_i]
exit if x==0

while s[0]+1<e[0]
  n=(s[0]+e[0])/2
  puts "#{n} 0"
  $>.flush
  x=gets.to_i
  exit if x==0
  if s[1]<e[1]
    e=[n,x]
  else
    s=[n,x]
  end
end
if s[1]<e[1]
  puts s*" "
else
  puts e*" "
end