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#include <bits/stdc++.h>
#define nl '\n'

using namespace std;
using ll = long long;

int main()
{
    cin.tie(0)->sync_with_stdio(0);
    string a, b, c;
    cin>>a>>b>>c;
    int n = a.size();
    vector<int> d(n, 0);
    for(int i=0; i<n; i++){
        d[i] = a[i] + b[i] - c[i] - '0';
    }
    d.push_back(2);
    ll res = 0;
    ll counter = 0;
    bool skip_mode = false;
    for(int i=0; i<=n; i++){
        if(skip_mode){
            if(d[i] == 9) continue;
            if(d[i] == 10){
                counter++;
                skip_mode = false;
                continue;
            }else{
                skip_mode = false;
                res += counter*(counter+1)/2;
                counter = 0;
            }
        }
        if(d[i] == 0){ counter++; }
        else if(d[i] == -1){
            skip_mode = true;
        }else{
            res += counter*(counter+1)/2;
            counter = 0;
        }
    }
    cout<<res<<nl;
    return 0;
}