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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 a, b, c;
	cin >> a >> b >> c;
	ll n = a.size();

	bool akt = false;
	ll wynik = 0, pWych = -1, l0 = 0;

	auto dodaj = [&]() {
		if (akt)
			wynik += l0 * (l0 - 1) / 2;
		akt = false;
		l0 = 0;
		pWych = -1;
	};

	for (ll i = n - 1; i >= 0; --i) {
		ll x = a[i] - '0';
		ll y = b[i] - '0';
		ll z = c[i] - '0';
		ll d = x + y - z;

		ll wch, wych;
		bool ok = true;

		if (d == 0) {
			wch = 0;
			wych = 0;
		} else if (d == 10) {
			wch = 0;
			wych = 1;
		} else if (d == -1) {
			wch = 1;
			wych = 0;
		} else if (d == 9) {
			wch = 1;
			wych = 1;
		} else {
			ok = false;
		}

		if (!ok) {
			dodaj();
			continue;
		}

		if (!akt || wch != pWych) {
			dodaj();
			akt = true;
			l0 = (wch == 0 ? 1 : 0);
		}

		l0 += (wych == 0 ? 1 : 0);
		pWych = wych;
	}

	dodaj();
	cout << wynik << '\n';
}