s = 'abcdefghijk'
m = s[3:6]
print (m)
m = s[:6]
print (m)
m = s[3:]
print (m)
m = s[::-1]
print (m)
m = s[-3:]
print (m)
m = s[:-6]
print (m)
m = s[-1:-10:-2]
print (m)