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#include <bits/stdc++.h>

using namespace std;

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

    string a, b, c;
    cin >> a >> b >> c;

    int n = a.size();

    vector<int> dp0(n), dp1(n);

    long long answer = 0;

    for (int i = 0; i < n; ++i)
    {
        if (a[i] - '0' + b[i] - '0' == c[i] - '0')
        {
            ++answer;
            ++dp0[i];
            dp1[i] = 0;

            if (i > 0)
            {
                answer += dp0[i - 1];
                dp0[i] += dp0[i - 1];
            }

        }
        else if ((a[i] - '0' + b[i] - '0') % 10 == c[i] - '0')
        {
            dp1[i] = 0;

            if (i > 0)
            {
                answer += dp1[i - 1];
                dp0[i] += dp1[i - 1];
            }
        }
        else if (a[i] - '0' + b[i] - '0' + 1 == c[i] - '0')
        {
            dp1[i] = 1;
            if (i > 0) dp1[i] += dp0[i - 1];
        }
        else if ((a[i] - '0' + b[i] - '0' + 1) % 10 == c[i] - '0')
        {
            if (i > 0) dp1[i] += dp1[i - 1];
        }
        else
        {
            dp0[i] = dp1[i] = 0;
        }
    }

    cout << answer << '\n';
}