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#include <iostream>
#include <string>
#include <vector>

using namespace std;

unsigned long long get_result(string const & a, string const & b, string const & c) {
    unsigned long long result = 0;
    vector<int> diff(a.length()+2, 2);
    for(int i = 0; i < a.length(); i++) {
        diff[i+1] = a[i] + b[i] - '0' - c[i];
    }
    
    unsigned long long cur_add = 0;
    for(int i = a.length(); i >= 1; i--) {
        if(diff[i] == 0) {
            cur_add++;
            result += cur_add;
        } else if(diff[i] == -1 && diff[i+1] == 10) {
            cur_add++;
            result += cur_add;
            diff[i]++;
        } else if(diff[i] == 9 && diff[i+1] == 10 && (diff[i-1] == -1 || diff[i-1] == 9)) {
            diff[i]++;
        } else if(diff[i] == 10 && (diff[i-1] == -1 || diff[i-1] == 9)) {
            continue;
        } else {
            cur_add = 0;
        }
    } 


    return result;
}

void solve() {
    string a, b, c;
    cin >> a >> b >> c;

    cout << get_result(a, b, c) << "\n";
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    solve();

    return 0;
}