s=input()
t=input()
count=0
temp=''
for i in range(len(s)):
    if(s[i]>='0' and s[i]<='9'):
        temp=s[0:i]+s[i+1:]
        if(temp < t):
            count+=1
    temp=''
for i in range(len(t)):
    if(t[i]>='0' and t[i]<='9'):
        temp=t[0:i]+t[i+1:]
        if(temp > s):
            count+=1
    temp=''
print(count)