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#include<bits/stdc++.h>
 
#define pb push_back
#define ppb pop_back
#define eb emplace_back
#define fi first
#define se second
#define turbo ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define mid ((l+r)/2)
#define midLL ((l+r)/2LL)
#define mide ((lo+hi)/2)
#define mideLL ((lo+hi)/2LL)
#define endl '\n'
#define random_shuffle shandom_ruffle
#define lowbit(x) x&(-x)
#define bits(x) __builtin_popcount(x) 
#define mins(se) (*se.begin())
#define maxs(se) (*--se.end())
#define all(x) x.begin(), x.end()
#define log2_floor(i) (i ? __builtin_clzll(1) - __builtin_clzll(i) : -1)
#define siz(cont) ((int)cont.size())
#define each(it, cont) for(auto &it : cont)
#define ein(cont) for(auto &it : cont) cin >> it;
#define mp(a, b) make_pair(a, b)

using ll = long long;
using pii = std::pair<int, int>;
using pll = std::pair<ll, ll>;
using pli = std::pair<ll, int>;
using pil = std::pair<int, ll>;
using vll = std::vector<pll>;
using vii = std::vector<pii>;
using vi = std::vector<int>;
using vl = std::vector<ll>;
using vvl = std::vector<vl>;
using vvi = std::vector<vi>;
using vvii = std::vector<vii>;
using vli = std::vector<pli>;
using vvli = std::vector<vli>;
using vil = std::vector<pil>;
using vvil = std::vector<vil>;
using vc = std::vector<char>;
using vvc = std::vector<std::vector<char>>;
using vb = std::vector<bool>;
using vvb = std::vector<vb>;

#ifdef JDKURWE
void err() { std::cout << "\n"; fflush(stdout); }
template<class T, class... Ts>
void err(T arg, Ts &... args) {
    std::cout << arg << ' ';
    err(args...);
}
#else 
void err() {}
template<class T, class... Ts>
void err(T arg, Ts &... args) {
    err(args...);
}
#endif

using namespace std;

constexpr ll M1 = 1e9 + 403;
constexpr ll M2 = 1e9 + 7;

constexpr ll pack(ll a, ll b) {
    return b*M1 + a;
}

signed main() { 
    turbo;
    string a, b, c; cin >> a >> b >> c;
    ll n = siz(a);

    unordered_map<ll, ll> cnt;
    cnt[0] = 1;

    ll sum1 = 0, sum2 = 0, pot1 = 1, pot2 = 1, res = 0;
    for (int i = n-1; i >= 0; i--) {
        sum1 = (sum1 + ((ll)a[i] + (ll)b[i] - (ll)c[i] - (ll)'0'+M1)%M1*pot1)%M1;
        sum2 = (sum2 + ((ll)a[i] + (ll)b[i] - (ll)c[i] - (ll)'0'+M2)%M2*pot2)%M2;

        res += cnt[pack(sum1, sum2)];
        cnt[pack(sum1, sum2)]++;

        pot1 = (pot1*10LL)%M1;
        pot2 = (pot2*10LL)%M2;
    }

    cout << res;
}