#!/usr/bin/env python
# -*- coding: utf-8 -*-
s1 = 'hello' * 3
print(s1)
s2 = 'world'
s1 += s2
print(s1)
print('ll' in s1)
print('good' in s1)
#!/usr/bin/env python
# -*- coding: utf-8 -*-
s1 = 'hello' * 3
print(s1)
s2 = 'world'
s1 += s2
print(s1)
print('ll' in s1)
print('good' in s1)
#!/usr/bin/env python # -*- coding: utf-8 -*-