import re
s = "230030215840▒Cumul Arte▒pl▒PROGRAMME_WEB▒SCI_nauka▒075631-005-A▒TV▒1"
tmp = s.split('▒')
tmp[5] = re.sub(r'^(\d{6}-\d{3})-([A-Z])$', r'\g<0>▒\1▒\2', tmp[5])
print("▒".join(tmp))
aW1wb3J0IHJlCnMgPSAiMjMwMDMwMjE1ODQw4paSQ3VtdWwgQXJ0ZeKWknBs4paSUFJPR1JBTU1FX1dFQuKWklNDSV9uYXVrYeKWkjA3NTYzMS0wMDUtQeKWklRW4paSMSIKdG1wID0gcy5zcGxpdCgn4paSJykKdG1wWzVdID0gcmUuc3ViKHInXihcZHs2fS1cZHszfSktKFtBLVpdKSQnLCByJ1xnPDA+4paSXDHilpJcMicsIHRtcFs1XSkKcHJpbnQoIuKWkiIuam9pbih0bXApKQ==