str1 = "The brave man is not the one who does not feel afraid, but he who conquers that fear"
print(str1.count('who')) # -- CO1
str2 = 'The more you practice, the better the concepts will be cleared.'
print(str2.count('the', 10)) # -- CO2
str3 = 'It is we who are responsible for all our misery and all our degradation'
print(str3.count('our',10,len(str3))) # -- CO3

str1 = "The brave man is not the one who does not feel afraid, but he who conquers that fear"
print(str1.count('who')) # -- CO1
str2 = 'The more you practice, the better the concepts will be cleared.'
print(str2.count('the', 10)) # -- CO2
str3 = 'It is we who are responsible for all our misery and all our degradation'
print(str3.count('our',10,len(str3))) # -- CO3

# -- CO1 # -- CO2 # -- CO3