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#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <cstdlib>

using namespace std;
 
 
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    string s1, s2, s3;
    cin >> s1 >> s2 >> s3;
    int n = (int)s1.size();
    
    long long out = 0;
    long long x = 0, y = 0;
    
    int it = n - 1;
    while(it >= 0){
        int calc = (int)(s1[it]-'0') + (int)(s2[it]-'0') - (int)(s3[it]-'0');
        
        if(calc == 0){
            x = x + 1;
            y = 0;
            out += x;
        }
        else if(calc == 10){
            y = x + 1;
            x = 0;
        }
        else if(calc == -1){
            x = y;
            y = 0;
            out += x;
        }
        else if(calc == 9){
            x = 0;
        }
        else{
            x = 0;
            y = 0;
        }
        --it;
    }
    
    cout << out;
    return 0;
}