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#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
using namespace std;
#define ll unsigned long long
string a, b, c;

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(nullptr);

    cin >> a >> b >> c;
    int n = a.size();
    int w = 0;

    for (int i = n - 1; i >= 0; i--)
    {
        int x, y, s, p = 0;
        if ((a[i] - '0' + b[i] - '0') % 10 == c[i] - '0')
        {
            for (int j = i; j >= 0; j--)
            {
                x = (a[j] - '0');
                y = (b[j] - '0');
                s = x + y + p;
                p = s / 10;
                //cout << s << " " << c[j] << endl;
                if (((char)'0' + s) == c[j])
                    w++;
                else if (((char)'0' + s % 10) == c[j])
                {

                }
                else
                    break;
            }
        }
       
    }
    cout << w;

}