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#include <bits/stdc++.h>
using namespace std;
long long wynik=0, akt=0, p=0;
string a, b, c;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin>>a>>b>>c;
    for(int i=a.size()-1; i>=0; i--)
    {
        //cout<<akt<<' ';
        if(p==0)
        {
            if(int(a[i])-48+int(b[i])-48==int(c[i])-48)
                akt++;
            else if((int(a[i])-48+int(b[i])-48)%10==int(c[i])-48)
                p=(int(a[i])-48+int(b[i])-48)/10;
            else
            {
                wynik=wynik+(akt*(akt+1))/2;
                akt=0;
            }
        }
        else if(p!=0)
        {
            if(int(a[i])-48+int(b[i])-48==int(c[i])-48)
            {
                akt++;
                p=0;
            }
            else if(int(a[i])-48+int(b[i])-48+p==int(c[i])-48)
            {
                akt++;
                p=(int(a[i])-48+int(b[i])-48+p)/10;
            }
            else if((int(a[i])-48+int(b[i])-48+p)%10==int(c[i])-48)
            {
                p=(int(a[i])-48+int(b[i])-48+p)/10;
                if(p==0)
                {
                    akt++;
                    wynik=wynik+(akt*(akt+1))/2;
                    akt=0;
                }
            }
            else if((int(a[i])-48+int(b[i])-48)%10==int(c[i])-48)
                p=(int(a[i]-48)+int(b[i])-48)/10;
            else
            {
                p=0;
                wynik=wynik+(akt*(akt+1))/2;
                akt=0;
            }
        }
    }
    wynik=wynik+(akt*(akt+1))/2;
    cout<<wynik;
    return 0;
}