#coding: utf-8
##yuki_203

s=raw_input()
t=raw_input()

wt=s+t
w=list(wt)

cnt_temp=1
cnt=0
cnt_res=0

i=0
while i<13:
 if w[i]=='x':
  cnt_temp=1
 if w[i]=='o' and w[i+1]=='o':
  cnt_temp+=1
  cnt=cnt_temp
 if cnt_res<cnt:
  cnt_res=cnt
 i+=1
print cnt_res