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#include <bits/stdc++.h>

using namespace std;
using LL = long long;
#define FOR(i, l, r) for(int i = (l); i <= (r); ++i)
#define REP(i, n) FOR(i, 0, (n) - 1)
#define ssize(x) int(x.size())

template<class A, class B> auto &operator<<(ostream &o, pair<A, B> p) {
    return o << '(' << p.first << ", " << p.second << ')';
}

template<class T> auto operator<<(ostream &o, T x) -> decltype(x.end(), o) {
    o << '{'; int i = 0; for (auto e : x) o << (", ")+2*!i++ << e;
    return o << '}';
}

#ifdef DEBUG
#define debug(x...) cerr << "[" #x "]: ", [](auto... $) {((cerr << $ << "; "), ...); }(x), cerr << '\n';
#else
#define debug(...) {}
#endif


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

    string a, b, c;
    cin >> a >> b >> c;
    int n = ssize(a);

    LL ans = 0, prev = 0;
    bool streak = false;
    REP(i, n) {
        int x = a[i] - '0';
        int y = b[i] - '0';
        int z = c[i] - '0';
        int r = (x + y) / 10;
        int digit = (x + y) % 10;

        debug(i, x, y, z, r, digit);
        debug(streak, prev);
        if (digit == z) {
            if (r == 1) {
                if (!streak)
                    prev = 0;
            }
            else {
                if (streak)
                    prev = 0;
                prev++;
            }
            streak = false;
            ans += prev;
        }
        else if ((digit + 1) % 10 == z) {
            if (digit == 9)
                r = 1;

            if (r == 0) {
                if (streak)
                    prev = 0;
                prev++;
                streak = true;
            }
            else {
                if (!streak)
                    prev = 0;
            }
        }
        else {
            prev = 0;
            streak = false;
        }
        debug(ans);
    }

    cout << ans << '\n';

    return 0;
}