import re
from itertools import count
line = r'#Совп. А# ... #Совп. Б# ... #Совп. В#'
counter = count(1)
line = re.sub(r'#[^#]*#', lambda x: '<{0}>{1}</{0}>'.format(str(next(counter)),x.group()), line)
print(line)
aW1wb3J0IHJlCmZyb20gaXRlcnRvb2xzIGltcG9ydCBjb3VudAoKbGluZSA9IHInI9Ch0L7QstC/LiDQkCMgLi4uICPQodC+0LLQvy4g0JEjIC4uLiAj0KHQvtCy0L8uINCSIycKY291bnRlciA9IGNvdW50KDEpCmxpbmUgPSByZS5zdWIocicjW14jXSojJywgbGFtYmRhIHg6ICc8ezB9PnsxfTwvezB9PicuZm9ybWF0KHN0cihuZXh0KGNvdW50ZXIpKSx4Lmdyb3VwKCkpLCBsaW5lKQpwcmludChsaW5lKQ==