import re

# string = "Tar-120umol"
# string = "120umol tar 1"
# string = "KMnO4-720umol"

# string = "1_BL 16.4_T2_2"

string = "HB-11-5"

# match = re.search(r'-(\d+)', string) or re.search(r'(\d+)', string)
match = re.search(r'-(\d+)$', string)

if match:
    extracted_number = int(match.group(1))
    print(extracted_number)
else:
    print("No number found")