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

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