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#include<bits/stdc++.h>
#define ull unsigned long long
#define int128 unsigned __int128
using namespace std;
int128 mod = ((int128)1<<64) - 6777;
int main()
{ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    string A,B,C;
    cin>>A>>B>>C;
    const int n=(int)A.size();
    long long wynik=0;
    unordered_map<ull,int>M;
    M[0]++;
    int128 poww=1,hasz=0;
    for(int i=n-1;i>=0;i--)
    {
        int128 u = A[i]+B[i]-C[i]-'0';
        u=(u+mod)%mod;
        hasz=(hasz+poww*u)%mod;
        poww=(poww*10)%mod;
        wynik+=M[hasz];
        M[hasz]++;
    }
    cout<<wynik<<'\n';
    return 0;
}