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#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll conv(char x){
    return x-'0';
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    string a,b,c; cin >> a >> b >> c;
    vector<vector<ll>> tab(a.size(), vector<ll>(2));
    ll i = 0;
    if((conv(a[i]) + conv(b[i])) == conv(c[i])){
        tab[i][0] = 1;
    }
    else{
        tab[i][0] = 0;
    }
    if((conv(a[i]) + conv(b[i])+1) == conv(c[i])){
        tab[i][1] = 1;
    }
    else{
        tab[i][1] = 0;
    }
    ll wyn = tab[i][0];
    for(ll i = 1; i < a.size(); ++i){
        if((conv(a[i]) + conv(b[i]))%10 == conv(c[i])){
            if(conv(a[i]) + conv(b[i]) >= 10){
                tab[i][0] = tab[i-1][1];
            }
            else tab[i][0] = (tab[i-1][0]+1);
        }
        else{
            tab[i][0] = 0;
        }
        if((conv(a[i]) + conv(b[i])+1)%10 == (conv(c[i]))){
            if(conv(a[i]) + conv(b[i]+1) >= 10){
                tab[i][1] = tab[i-1][1];
            }
            else tab[i][1] = (tab[i-1][0]+1);
        }
        else{
            tab[i][1] = 0;
        }
        wyn += tab[i][0];
    }
    cout << wyn;
}