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#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG
auto &operator<<(auto &o, pair<auto, auto> p) {
    return o << "(" << p.first << ", " << p.second <<")";
}
auto operator<<(auto &o, auto x)-> decltype(x.end(), o) {
    o << "{";int i = 0;
    for(auto e : x) o << ", "+!i++<<e;
    return o <<"}";
}
#define debug(x...) cerr << "["#x"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(x)
#else
#define debug(...) {}
#endif

#define int long long
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
#define pb push_back
#define fi first
#define se second
typedef pair <int, int> pii;


void test() {
    debug("TC______________________");
    string a, b, c; cin>>a>>b>>c;

    int n = sz(a);

    vector <int> A(n+1); 
    vector <int> B(n+1);
    vector <int> C(n+1);

    for (int i=0; i<n; ++i) {
        A[i] = a[i] - '0';
    }
    for (int i=0; i<n; ++i) {
        B[i] = b[i] - '0';
    }
    for (int i=0; i<n; ++i) {
        C[i] = c[i] - '0';
    }

    vector <int> pot(n);
    vector <int> gen(n);
    vector <int> z(n);

    for (int i=0; i<n; ++i) {
        int x = A[i] + B[i];
        if ((x+1)%10 == C[i]) {
            pot[i] = 1;
            if (x >= 9) {
                gen[i] = 1;
            }
            else {
                gen[i] = 0;
            }
        }
        else if (x%10 == C[i]) {
            if (x >= 10) {
                gen[i] = 1;
            }
            else {
                gen[i] = 0;
            }
        }   
        else {
            z[i] = 1;
            debug(i, a[i], b[i], c[i], "zle");
        }
    }
    int cng = 0;
    int res = 0;

    for (int i=0; i<n; ++i) {
        if (z[i]) {
            cng = 0;
            continue;
        }

        if (pot[i] && gen[i+1]) {
            if (!gen[i]) cng++;
        }
        else if (pot[i] && !gen[i+1]) {
            cng = 0;
        }
        else if (!pot[i] && gen[i+1]) {
            if (!gen[i]) cng++;
            res += cng;
            cng = 0;
        }
        else { // !pot && !gen
            if (!gen[i]) cng++;

            res += cng;
        }
    }

    cout<<res<<'\n';

    debug(pot);
    debug(gen);

}

signed main() {
  ios_base::sync_with_stdio(0); cin.tie(0);
  int t = 1; 
  while (t--) {
    test();
  }
}