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#include <iostream>
#include <string>

using namespace std;

int main()
{

    std::ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    cout.tie(nullptr);

    string a, b, c;
    cin>>a>>b>>c;

    int licz = 0;

    int ile_next = 0;
    for(int i = a.size() - 1; i >= 0; --i)
    {
        int wart1 = (int)a.at(i) - 48;
        int wart2 = (int)b.at(i) - 48;
        int sum = (int)c.at(i) - 48;
        int obliczona = (wart1+wart2)%10+ile_next;
        ile_next = (wart1+wart2)/10;
        if(obliczona == sum)
        {
            ++licz;
        }
    }

    cout<<licz;
}