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#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    
    string a, b, c;
    cin >> a >> b >> c;
    int n = a.size();
    int odp = 0;
    vector <vector<int>> dp(n, vector<int>(2));

    for (int i = 0; i < n; i++) {
        dp[i][0] = dp[i][1] = 0;

        int d = (a[i] - '0')+(b[i] - '0') - (c[i] - '0');

        bool start = (d == 0 || d == -1);
        int s;
        if (d == 0 || d == 10)
            s = 0;
        else if (d == -1 || d == 9)
            s = 1;
        else
            continue;

        if (start) {
            if (i > 0)
                dp[i][s] =  dp[i-1][0] + 1;
            else
                dp[i][s] = 1;
        }else 
            if (i > 0)
                dp[i][s] = dp[i-1][1];

        odp += dp[i][0];
    }
    cout << odp;
}