files_list = ['L_res', 'G_res', 'S_res', 'D_res']
out_file = open('LGSD_combined_res', 'w')

for file_name in files_list:
  file = open(file_name, 'r')
  line = file.readline()
  row = line.rstrip('\n').split("\t")
  if row[1]!= "":
    print >> out_file, "LGSD\t" + row[1]
    break