L=list(input())
T=list(input())
L+=T
#int (L)
G=0
i=0
while i <14:
    if L[i]=="o":
        C=0
        while i<14 and L[i]=="o":
            C+=1
            i+=1
  #          print (i)
        if C>G:
            G=C
    #    print ("t")
    i+=1
print (G)