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#include<bits/stdc++.h>
using namespace std;

string s1, s2, s3;

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