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#include "bits/stdc++.h"

#define all(v) (v).begin(), (v).end()
#define st first
#define nd second
#define pb push_back
#define printv(a) { for(auto u : a) cout<<u<<" "; cout<<"\n"; }
#define debug(x) cerr << #x << " = " << x << '\n';

using namespace std;
using ll = long long;
using pii = pair<int,int>;
using vi = vector<int>;
using si = set<int>;
using mii = map<int,int>;

ll dp[1000005][2];


int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    string s1,s2,s3;
    cin>>s1>>s2>>s3;
    int n = s1.size();
    ll wyn = 0;
    dp[0][0] = 0;
    dp[0][1] = 0;
    for(int i=1;i<=n;i++){
        ll a,b,c;
        a = s1[i-1] - '0';
        b = s2[i-1] - '0';
        c = s3[i-1] - '0';
        ll s = a+b, sc = a + b + 1;
        if(s % 10 == c){
            dp[i][1] = 0;
            if(s < 10){
                dp[i][0] = dp[i-1][0] + 1;
            }else{
                dp[i][0] = dp[i-1][1];
            }
        }else if(sc % 10 == c){
            dp[i][0] = 0;
            if(sc < 10){
                dp[i][1] = dp[i-1][0] + 1;
            }else{
                dp[i][1] = dp[i-1][1];
            }
        }else{
            dp[i][0] = 0;
            dp[i][1] = 0;
        }
        wyn += dp[i][0];
    }
    cout<<wyn<<endl;
    return 0;
}