s = ' i am a boy'
print(s)
print(s.replace('am','is'))

s = 'This is Pneumonoultramicroscopicsilicovolcanoconiosis it a name of illness'
print(s.count('This'))
print(s.count('it'))
print(s.count('is'))
print(s.count('illness'))
print(s.count('name'))
print(s.count('of'))
print(s.count('Pneumonoultramicroscopicsilicovolcanoconiosis'))

