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#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define int long long
#define mp make_pair
signed main()
{
    //legenda :
    //1 -> jest cacy
    //2 -> wymaga przeniesienia
    //3 -> nie dziala
    //4 -> przenosi i dziala
    //5 -> przenosi i wymaga przeniesienia
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    string a , b , c;
    cin >> a >> b >> c;
    int n = a.size();
    int ans = 0;
    vector <int> dp(7 , 0);
    for(int i = n - 1; i >= 0; i--)
    {
        int sum = a[i] - '0';
        sum += b[i] - '0';
        int target = c[i] - '0';
        if(sum == target)
        {
            dp[1]++;
            dp[2] = 0;
        }
        else if(sum + 1 == target)
        {
            dp[1] = dp[2];
            dp[2] = 0;
        }
        else if(sum - 10 == target)
        {
            dp[2] = dp[1] + 1;
            dp[1] = 0;
        }
        else if(sum - 10 + 1 == target)
        {
            dp[1] = 0;
        }
        else
        {
            dp[1] = 0;
            dp[2] = 0;
        }
        ans += dp[1];
    }
    cout << ans;
    return 0;
}