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#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define BOOST ios_base::sync_with_stdio(0), cin.tie(0)
template<typename T>
using vc = vector<T>;
using ll = long long;
using ld = long double;
using ii = pair<int, int>;

const int N = 1e6 + 5;
int dp[2][N];

int main(){
	BOOST;
	string _a, _b, _c;
	cin >> _a >> _b >> _c;
	int n = _a.size();
	vc<int> a(n+2), b(n+2), c(n+2);

	for(int i=1; i<=n; i++){
		a[i] = _a[i-1] - '0';
		b[i] = _b[i-1] - '0';
		c[i] = _c[i-1] - '0';
	}

	ll ans = 0;
	for(int i=n; i>=1; i--){
		int sum = a[i] + b[i];
		if(sum == c[i]){
			dp[0][i] = dp[0][i+1] + 1;
		}
		if(sum-10 == c[i]){
			dp[1][i] = dp[0][i+1] + 1;
		}
		if(sum+1 == c[i]){
			dp[0][i] = dp[1][i+1];
		}
		if(sum+1-10 == c[i]){
			dp[1][i] = dp[1][i+1];
		}
		ans += dp[0][i];
	}

	cout << ans << "\n";
}