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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    string num1, num2, result;
    cin >> num1 >> num2 >> result;
    ll rest = 0;
    ll current_sequence = 0;
    ll score = 0;
    for (int c = num1.size() - 1; c >= 0; c--)
    {
        ll n1 = num1[c] - '0';
        ll n2 = num2[c] - '0';
        ll r = result[c] - '0';
        if ((n1 + n2 + rest) % 10 == r)
        {
            rest = (n1 + n2 + rest) / 10;
            if (rest == 0)
            {
                current_sequence++;
            }
        }
        else if ((n1 + n2) % 10 == r)
        {
            score += ((1 + current_sequence) * current_sequence / 2);
            current_sequence = 0;
            rest = (n1 + n2) / 10;
            if (rest == 0)
            {
                current_sequence++;
            }
        }
        else
        {
            score += ((1 + current_sequence) * current_sequence / 2);
            current_sequence = 0;
            rest = 0;
        }
    }
    score += ((1 + current_sequence) * current_sequence / 2);
    cout << score << endl;
}