import re
a= ['''alkalaklaklakalkaalaklakalkalaklaalkal,alkkllaklllaklllka,
akalakalkalakhgalgh, ghoahlhoonlaholh,
khlalkhalkhlahlakhlhlakhlahkahlhakhalh''']
for s in a:
print(re.findall(r"^[^\S\r\n]*(\S{6})", s, re.MULTILINE))
aW1wb3J0IHJlCgphPSBbJycnYWxrYWxha2xha2xha2Fsa2FhbGFrbGFrYWxrYWxha2xhYWxrYWwsYWxra2xsYWtsbGxha2xsbGthLAogICAgYWthbGFrYWxrYWxha2hnYWxnaCwgZ2hvYWhsaG9vbmxhaG9saCwKICAgICBraGxhbGtoYWxraGxhaGxha2hsaGxha2hsYWhrYWhsaGFraGFsaCcnJ10KZm9yIHMgaW4gYToKICAgIHByaW50KHJlLmZpbmRhbGwociJeW15cU1xyXG5dKihcU3s2fSkiLCBzLCByZS5NVUxUSUxJTkUpKQ==