#include<iostream>
#include<vector>

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

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

    const int n = (int)a.size();

    std::vector<std::vector<int>> dp(n + 1, {0, 0});
    dp[0][0] = 1;

    auto get = [](std::string_view s, int pos) {
        return s[pos] - '0';
    };

    long long res = 0;

    for (int i = 0; i < n; ++i) {
        if (get(a, i) + get(b, i) == get(c, i)) {
            dp[i + 1][0] = dp[i][0];
        }
        if (get(a, i) + get(b, i) + 1 == get(c, i)) {
            dp[i + 1][1] = dp[i][0];
        }
        if (get(a, i) + get(b, i) - 10 == get(c, i)) {
            dp[i + 1][0] = dp[i][1];
        }
        if (get(a, i) + get(b, i) + 1 - 10 == get(c, i)) {
            dp[i + 1][1] = dp[i][1];
        }
        res += dp[i + 1][0];
        
        dp[i + 1][0]++;
    }
    
    std::cout << res << '\n';
}