#_*_ coding:utf-8 _*_
a='abs'
print a[0]
print a[0:2]
print a*4
print a+'北京'
print 'a' in a
print 'a' not in a
#a
#ab
#absabsabsabs
#abs北京
#True
#False
#_*_ coding:utf-8 _*_
a='abs'
print a[0]
print a[0:2]
print a*4
print a+'北京'
print 'a' in a
print 'a' not in a
#a
#ab
#absabsabsabs
#abs北京
#True
#False