#! /usr/bin/ruby

STDIN.each { |s|
  (addr, pos, f) = s.split()
  pos = pos.to_i
  fd = File.open(f)
  fd.seek(pos)
  n = pos
  fd.each { |s|
    break if n != pos && s =~ /^From\s+/
    puts s
    n += s.length
  }
}