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

int main()
{
ios_base::sync_with_stdio(0);
cout.tie(0);
cin.tie(0);

long long n, p_r = 0, r = 0, c_r = 0;
string a, b, c;
cin >> a >> b >> c;

n = a.size();
vector<long long> dp(n + 3), dpb(n + 3);

if(n == 1)
{
    if(a[0] + b[0] == c[0] + 48) r++;
    cout << r;
    return 0;
}
if(a[n - 1] + b[n - 1] == c[n - 1] + 48) dp[n - 1]++, r++;

if(a[n - 2] + b[n - 2] == c[n - 2] + 48)
{
    dp[n - 2] = dp[n - 1] + 1;
    r += dp[n - 2];
}
else if(a[n - 2] + b[n - 2] + 1 == c[n - 2] + 48)
{
    if(a[n - 1] + b[n - 1] - 10 == c[n - 1] + 48)
    {
        dpb[n - 2] = 1, r++;
    }
}

for(int i = n - 3; i >= 0; i--)
{
    if(a[i] + b[i] == c[i] + 48)
    {
        if(a[i + 1] + b[i + 1] == c[i + 1] + 48) dp[i] = dp[i + 1] + 1;
        else if(a[i + 1] + b[i + 1] + 1 == c[i + 1] + 48) dp[i] = dpb[i + 1] + 1;
    }
    else if(a[i] + b[i] + 1 == c[i] + 48)
    {
        if(a[i + 1] + b[i + 1] - 10 == c[i + 1] + 48) dpb[i] = dp[i + 2] + 1;
        if(a[i + 1] + b[i + 1] - 9 == c[i + 1] + 48) dpb[i] = dpb[i + 2] + dp[i + 2] + 1;
    }
    r += (dp[i] + dpb[i]);
}

cout << r;

return 0;
}
/*
037523
040834
978367
*/