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

#define rep(i, a, b) for (int i = (a); i < (b); i++)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define ST first
#define ND second
#define PB push_back
using ll = long long;
using ld = long double;
using pi = pair<int,int>;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;


#ifdef LOCAL
#define DTP(x, y)                                    \
    auto operator<<(auto &o, auto a)->decltype(y, o) \
    {                                                \
        o << "(";                                    \
        x;                                           \
        return o << ")";                             \
    }
DTP(o << a.first << ", " << a.second, a.second);
DTP(for (auto i : a) o << i << ", ", all(a));
void dump(auto... x) { ((cerr << x << ", "), ...) << '\n'; }
#define debug(x...) cerr << setw(4) << __LINE__ << ":[" #x "]: ", dump(x)
#else
#define debug(...) 0
#endif



void Solve()
{
    int n;
    string s;
    cin >> s;
    n=s.length();
    vi A(n+1);
    vi B(n+1);
    vi C(n+1);
    rep(i, 1, n+1){
        A[i]=s[i-1]-'0';
    }
    cin >> s;
    rep(i, 1, n+1){
        B[i]=s[i-1]-'0';
    }
    cin >> s;
    rep(i, 1, n+1){
        C[i]=s[i-1]-'0';
    }
    vi dp(n+1);
    rep(i, 1, n+1){
        if(A[i]+B[i]==C[i])
            dp[i]=1+dp[i-1];
        if(A[i]+B[i]==C[i]+10){
            for(int j=i-1; j>=0; --j){
                if(A[j]+B[j]+1==C[j]){
                    dp[i]=dp[j-1]+1;
                    break;
                }else if(A[j]+B[j]+1!=C[j]+10){
                    break;
                }
            }
        }
    }
    ll res=0;
    rep(i, 1, n+1)
        res+=(ll)(dp[i]);
    cout << res << "\n";
    return;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int t=1;
    // cin >> t;    
    while(t--)
    {
        Solve();
    }
    return 0;
}