#include <vector>
#include <iostream>
#include <string>

using namespace std;
using ll = long long;

ll mstoi(string &s, ll l, ll r){
    ll w = 0;
    for (ll i = l; i < r; ++i){
        w *= 10;
        w += s[i] - '0';
    }
    return w;
}

ll ilec(ll a){
    ll w = 0;
    if (a == 0) return 1;
    while (a){
        a /= 10;
        w++;
    }
    return w;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    string s[3];
    cin >> s[0] >> s[1] >> s[2];
//    reverse(s[0].begin(), s[0].end());
//    reverse(s[1].begin(), s[1].end());
//    reverse(s[2].begin(), s[2].end());
    ll n = (ll) s[0].size();
    ll w = 0;
    vector<ll> p1(n + 2, 0), p0(n + 2, 0);
    for (ll i = 0; i < n; ++i){
        w += p0[i];
        ll a = s[0][i] - '0', b = s[1][i] - '0', c = s[2][i] - '0';
        if (a + b == c){
            p0[i + 1] = p0[i] + 1;
            p1[i + 1] = 0;
        } else if (a + b == c + 9){
            p0[i + 1] = 0;
            p1[i + 1] = p1[i];
        } else if (a + b == c - 1){
            p0[i + 1] = 0;
            p1[i + 1] = p0[i] + 1;
        } else if (a + b == c + 10){
            p0[i + 1] = p1[i];
            p1[i + 1] = 0;
        }
    }
    w += p0[n];
    cout << w << endl;
}