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#include <iostream>

using namespace std;

int main()
{
    uint64_t counter = 0, tmp_counter = 0;
    bool continuation = false;

    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    string s1, s2, s3;
    std::cin >> s1 >> s2 >> s3;

    for(int i = 0; i < s1.size(); ++i){
        if(s1[i] + s2[i] - 48 == s3[i]){
            s3[i] = 0;
        }
        else if(s1[i] + s2[i] - 48 == s3[i] - 1){
            s3[i] = 1;
        }
        else if(s1[i] + s2[i] - 48 == s3[i] + 10){
            s3[i] = 10;
        }
        else if(s1[i] + s2[i] - 48 == s3[i] + 9){
            s3[i] = 9;
        }
        else{
            s3[i] = 2;
        }
    }
    for(int i = 0; i < s1.size(); ++i){
        if(continuation){
            if(s3[i] == 9){
                //pass
            }
            else if(s3[i] == 10){
                ++tmp_counter;
                continuation = false;
            }
            else if(s3[i] == 1){
                counter += (tmp_counter * (tmp_counter + 1)) >> 1;
                tmp_counter = 0;
            }
            else if(s3[i] == 0){
                counter += (tmp_counter * (tmp_counter + 1)) >> 1;
                tmp_counter = 1;
                continuation = false;
            }
            else{
                counter += (tmp_counter * (tmp_counter + 1)) >> 1;
                tmp_counter = 0;
                continuation = false;
            }
        }
        else{
            if(s3[i] == 0){
                ++tmp_counter;
            }
            else if(s3[i] == 1){
                continuation = true;
            }
            else{
                counter += (tmp_counter * (tmp_counter + 1)) >> 1;
                tmp_counter = 0;
            }
        }

    }
    counter += (tmp_counter * (tmp_counter + 1)) >> 1;
    std::cout << counter << std::endl;
    cout.flush();
    return 0;
}