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#include <bits/stdc++.h>

typedef unsigned long long ll;

using namespace std;

ll get(char s) {
    return (ll)(s - '0');
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    string a, b, c;
    cin >> a >> b >> c;

    std::vector<std::vector<ll>> dp(a.size() + 1, std::vector<ll>(10));

    ll sum = 0, rest, newRest;
    for (int i = a.size() - 1; i >= 0; --i) {
        sum = get(a[i]) + get(b[i]);
        rest = sum / 10;
        sum %= 10;

        newRest = (10 + get(c[i]) - sum) % 10;

        if (sum == get(c[i])) dp[i][rest] = 1 + dp[i+1][0];
        else dp[i][rest + (sum + newRest) / 10] = dp[i+1][newRest];
    }

    ll result = 0;

    for (int i = 0; i < a.size(); ++i) {
        result += dp[i][0];
    }

    cout << result;
}