#include <bits/stdc++.h>
#define F(i, a, b) for(int i = a; i <= b; i++)
#define R(i, a, b) for(int i = a; i >= b; i--)
#define pb push_back
#define be(X) X.begin(), X.end()
#define pii pair<int,int>
#define V vector
#define f first
#define s second
#define int long long
using namespace std;

int32_t main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

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

    int w1 = 0, w2 = 0;
    int ans = 0;

    R(i, (int)a.size()-1, 0){
        int w11 = 0, w21 = 0;
        int roz = (a[i] - '0') + (b[i] - '0') - (c[i] - '0');

        if(roz == 0){
            w11 = w1 + 1;
        }
        if(roz == -1){
            w11 = w2;
        } 
        if(roz == 9){
            w21 = w2;
        }
        if(roz == 10){
            w21 = w1 + 1;
        }
        
        w1 = w11;
        w2 = w21;
        ans += w1;
    }

    cout << ans;
}