C1=input()
C2=input()
C=C1+C2

cnt=0
cnt_l=[]

for i in range(13):
    if C[i]==C[i+1]=='o':
        cnt+=1
    else:
        cnt=0
    cnt_l.append(cnt)

if 'o' not in C:
    print(0)
else:
    print(max(cnt_l)+1)