s1=input()
s2=input()
s=s1+s2+"x"
c=0
l=[]
for i in range(14):
    if s[i]=="o":
        c+=1

        if s[i+1]!="o":
            l.append(c)
            c=0

if len(l)==0:
    print(0)
else:
    print(max(l))