def cal(s):
    ans=0
    for i in range(len(s)):
        ans=__________
    return ans
sy=input() #样文
sc=input() #输入
st=""
__________
score=0
n=min(len(sy),len(sc))
for i in range(n):
    if sc[i]!=sy[i]:
        result=result+"0"
        score+=__________
        __________
    else:
        result=result+"1"
        st="1"+st
print(result)

...
...

print(score)