( bAndie9100 | 2016. 02. 22., h – 14:42 )

s = "BBBB"  # ezt keressuk a sorok elejen
A = 5  # hany sort mutassunk egy talalat utan
a = 0
f = open('valami.txt','r')
while True:
  l = f.readline()
  if l == '': break
  p = False
  if a>0:
    p = True
    a -= 1
  if l.startswith(s):
    p = True
    a = A
  if p:
    print l

~~~~~~~~
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