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#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    string a, b, c;
    cin >> a >> b >> c;
    int n = a.size();
    vector<long long> pak = {0};
    int fl = 0, a1, b1, c1;
    for(int i=n-1;i>=0;i--)
    {
        a1 = (int)(a[i])-48;
        b1 = (int)(b[i])-48;
        c1 = (int)(c[i])-48;
        if(fl == 0)
        {
            if(a1+b1==c1)
            {
                pak[pak.size()-1] += 1;
                continue;
            }
            if((a1+b1)%10 == c1)
            {
                fl = 1;
                continue;
            }
            if(pak[pak.size()-1] > 0)
            {
                pak.push_back(0);
            }
        }
        else
        {
            if(a1+b1+1 == c1)
            {
                pak[pak.size()-1] += 1;
                fl = 0;
                continue;
            }
            if(a1+b1 == c1)
            {
                fl = 0;
                pak.push_back(1);
                continue;
            }
            if((a1+b1+1)%10 == c1)
            {
                continue;
            }
            if((a1+b1)%10 == c1)
            {
                if(pak[pak.size()-1] > 0)
                {
                    pak.push_back(0);
                }
                continue;
            }
            if(pak[pak.size()-1] > 0)
            {
                pak.push_back(0);
            }
            fl = 0;
        }
    }
    long long wyn = 0;
    for(int i=0;i<pak.size();i++)
    {
        wyn += pak[i]*(pak[i]+1)/2;
        //cout << pak[i] << ' ';
    }
    cout << wyn;
    return 0;
}