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#include <bits/stdc++.h>
#define F first
#define S second
#define pii pair<int, int>
using namespace std;
using ll = long long;
using ld = long double;

constexpr int SIZE = 1e6+6;

ll dp[SIZE][2];

ll ans = 0;

string As, Bs, Cs;

int A[SIZE];
int B[SIZE];
int C[SIZE];

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

	cin >> As >> Bs >> Cs;

    int n = As.size();

	for (int i=0; i<n; i++) A[n-i] = As[i]-'0';
	for (int i=0; i<n; i++) B[n-i] = Bs[i]-'0';
	for (int i=0; i<n; i++) C[n-i] = Cs[i]-'0';

	for (int i=1; i<=n; i++){
		if (A[i]+B[i] == C[i]) dp[i][0] = dp[i-1][0]+1;
		if (A[i]+B[i] == C[i] + 10) dp[i][1] = dp[i-1][0]+1;

		if (A[i]+B[i]+1 == C[i]) dp[i][0] = dp[i-1][1];
		if (A[i]+B[i]+1 == C[i] + 10) dp[i][1] = dp[i-1][1];

		ans += dp[i][0];
	}

	cout << ans;
	

return 0;}