# num=10
# num1=20
# print(num+num1)
# print(num-num1)
# print(num*num1)
# print(num/num1)
# print("is num!=num1?",num!=num1)


string ='python is good to learn'
print(string.count('o'))
print(len(string))
print(string[1:7])
print(string[::-1])
print(set(string))



a=10.5
print(type(a))