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#include <cstdint>
#include <string>
#include <iostream>
using namespace std;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    
    string a, b, c; cin >> a >> b >> c;
    int64_t cur = 0, res = 0; 
    for (int i = (int)a.size() - 1; i >= 0; i--) {
        int x = a[i] - '0', y = b[i] - '0', z = c[i] - '0';
        // cout << i << ": " << x << ' ' << y << ' ' << z << " -------\n";
        
        bool flag = false;
        while (i > 0 && x + y > 9) {
            if ((x + y) % 10 != z) break;
            flag = true;
            i--;
            x = a[i] - '0' + 1, y = b[i] - '0', z = c[i] - '0';
        }
        if (flag) {
            // cout << "flag\n";
            if (x + y == z) { 
                cur++;
            } else {
                // cout << i << '\n';
                res += cur * (cur + 1) / 2;
                cur = 0;
                i++;
            }
            continue;
        }
        // cout << i << ": " << x << ' ' << y << ' ' << z << '\n';

        if (x + y == z) cur++;
        else {
            res += cur * (cur + 1) / 2;
            cur = 0;
        }
        // cout << cur << ' ' << res << '\n';
    }
    res += cur * (cur + 1) / 2;
    cout << res << '\n';
    return 0;
}
/*

908167587018185034
181983446608390336
187098806322030140

1481
2022
3503

58
02
50

666
196
852

037523
040834
978367

*/