class Solution:
# @param A : string
# @return a list of integers
def flip(self, A):
l=[]
left=-1
right=-1
maxCount=0
reset=True
count=0
curleft=0
for i in range(len(A)):
if A[i]=='0':
if reset:
curleft=i
reset=False
count+=1
else:
if count>maxCount:
maxCount=count
left=curleft+1
right=i
if count>0:
count-=1
else:
count=0
reset=True
if count>maxCount:
maxCount=count
left=curleft+1
right=len(A)
if right>(-1):
l.append(left)
l.append(right)
return l