Cfirst = input()
Csecond = input()
C = Cfirst + Csecond

if "oooooooooooooo" in C :
    print(14)
elif "ooooooooooooo" in C :
    print(13)
elif "oooooooooooo" in C :
    print(12)
elif "ooooooooooo" in C :
    print(11)
elif "oooooooooo" in C :
    print(10)
elif "ooooooooo" in C :
    print(9)
elif "oooooooo" in C :
    print(8)
elif "ooooooo" in C :
    print(7)
elif "oooooo" in C :
    print(6)
elif "ooooo" in C :
    print(5)
elif "oooo" in C :
    print(4)
elif "ooo" in C :
    print(3)
elif "oo" in C :
    print(2)
elif "o" in C :
    print(1)
else :
    print(0)