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#include <bits/stdc++.h>

using namespace std;



int main() {
    // std::ios_base::sync_with_stdio(false);
    // std::cin.tie(NULL);

    long long maks=0;
    string s1,s2,s3;
    cin>>s1>>s2>>s3;

    vector<long long> nums;
    long long len = s1.length();

    nums.assign(len,0);

    for (long long i=0;i<len;i++) nums[i] = s1[i]+s2[i]-s3[i]-48;

    vector<long long> res_ends(len+1,0);

    bool ciag = false;
    long long P=len-1,L=0;

    res_ends[len] = 0;

    for (long long i=len-1;i>=0;i--) {
        if (nums[i]==0) {
            ciag=false;
            res_ends[i] = res_ends[i+1]+1;
            P=i;
        }
        else if (nums[i]==10) {
            P=i;
            ciag = true;
        }
        else if (nums[i]==9) {
            if (ciag==false) P=i;
        }
        else if (nums[i]==-1) {
            if (ciag==true) res_ends[i] = 1+res_ends[P+1];
            ciag=false;
            P=i;
        } else {
            P=i;
            ciag = false;
        }
    }
    long long wynik=0;
    for (long long i=0;i<len;i++) {
        wynik+=res_ends[i];
    }
    cout<<wynik;
    return 0;
}