Week1 = str(input())
Week2 = str(input())
WeekAll = Week1 + Week2
count = 0
maxCount = 0

for i in range(len(WeekAll)):
    if(str(WeekAll[i]) == "o"):
        count += 1
    else:
        if(maxCount < count):
            maxCount = count
        count = 0
if(maxCount < count):
    maxCount = count

print(maxCount)