# 1706.py

a='01201012345014501020'

print a.find('0120')
# 0
print a.find('01',2)
# 3

print a.rfind('010')
# 15

print a.count('01')
# 5

print a.startswith('012')
# True
print a.startswith('120')
# False
print a.startswith('120',1)
# True
print a.startswith('120',1,2)
# False