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#include <bits/stdc++.h>
using namespace std;
using ll = long long;

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

    ll n;
    string a, b, c;
    cin >> a >> b >> c;
    n = a.size();
    ll wyn = 0;
    ll ter = 0;
    ll przen = 0;
    for (ll i = n - 1; i >= 0; i--) {
        ll ai = (ll)a[i] - '0', bi = (ll)b[i] - '0', ci = (ll)c[i] - '0';
        if (przen == 0) {
            if ((ai + bi)%10 != ci) {
                wyn += (ter+1)*ter / 2;
                ter = 0;
                continue;
            }
            if (ai + bi >= 10 ) {
                przen = 1;
                continue;
            }
            ter++;
        }
        else {
            przen = 0;
            if ((ai + bi + 1)%10 != ci) {
                wyn += (ter+1)*ter / 2;
                ter = 0;
                if ((ai + bi)%10 != ci) {
                    continue;
                }
                if (ai + bi >= 10 ) {
                    przen = 1;
                    continue;
                }
                ter++;
                continue;
            }
            if (ai + bi + 1 >= 10 ) {
                przen = 1;
                continue;
            }
            ter++;
        }
    }
    wyn += (ter+1)*ter / 2;
    cout << wyn << '\n';
}