# coding=utf-8:

c1 = str(input())
c2 = str(input())
cTotal = c1 + c2
cList = list()

for i in range(len(cTotal)):
    cList.append(cTotal[i])

j = 0
hCount = 0
hCountList = list()
for str in cList:
    if str == "o":
        hCount += 1
        j += 1
        if j == len(cList):
            hCountList.append(hCount)
            break

    elif str == "x":
        hCountList.append(hCount)
        hCount = 0
        j += 1
     
hCountSet = set(hCountList)
print(max(hCountSet))