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#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    ll n, w=0, i;
    string a, b, c;
    cin >> a >> b >> c;
    n = a.size();
    
    vector < vector <ll> > dp(n, {0, 0, 0});
    for (i=n-1; i>=0; --i){
        ll x=ll(a[i]-'0') + ll(b[i]-'0'), y=ll(c[i]-'0');
        if (x %10 == y){
            if (i<n-1 && dp[i+1][0]>0 && dp[i+1][1]){
                if (x /10 == 1)
                    dp[i] = {dp[i+1][0] +1, 0, 1};
                else
                    dp[i] = {dp[i+1][0] +1, 1, 0};
            }
            else{
                if (x /10 == 1)
                    dp[i] = {1, 0, 1};
                else
                    dp[i] = {1, 1, 0};
            }
        }
        if ((x +1) %10 == y){
            if (i<n-1 && dp[i+1][0]>0 && dp[i+1][2]){
                if ((x +1) /10 == 1)
                    dp[i] = {dp[i+1][0], 0, 1};
                else
                    dp[i] = {dp[i+1][0], 1, 0};
            }
        }
        
        if (dp[i][2] == 0)
            w += dp[i][0];
    }
    
    cout << w << '\n';

    return 0;
}