C1=list(input())
C2=list(input())
g= C1+C2
ans=0
cnt=1
now=g[0]
for i in range(1,14):
    if now=="o":
        if g[i]=="o":
            cnt+=1
        else:
            cnt=0
        now==g[i]
    else:
        if g[i]=="o":
            cnt+=1
        else:
            cnt=0
        now==g[i]
    
    ans=max(ans,cnt)

print(ans)