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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ff first
#define ss second
#define pb push_back

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

    string a,b,c; cin>>a>>b>>c;

    vector<int> in((int)a.size()), out((int) a.size());

    for(int i=0; i<(int)a.size(); i++)
    {
        if((a[i]-'0')+(b[i]-'0')-(c[i]-'0')==-1)
        {
            in[i]=1;    out[i]=0;
        }
        else if((a[i]-'0')+(b[i]-'0')-(c[i]-'0')==0)
        {
            in[i]=0;    out[i]=0;
        }
        else if((a[i]-'0')+(b[i]-'0')-(c[i]-'0')==9)
        {
            out[i]=1;  in[i]=1;
        }
        else if((a[i]-'0')+(b[i]-'0')-(c[i]-'0')==10)
        {
            out[i]=1;  in[i]=0;
        }
        else
        {
            out[i]=-1;   in[i]=-1;
        }
    }


    ll ans=0;
    ll poczatki=0;
    for(int i=0; i<(int)a.size(); i++)
    {
        if(out[i]==-1) {poczatki=0; continue;}
        if(i>0 && in[i-1]!=out[i]) poczatki=0;
        if(i==0 && out[i]==1) poczatki=0;
        if(out[i]==0) poczatki++;
        if(in[i]==0) ans+=poczatki;
    }

    cout<<ans<<'\n';

}