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#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ll n, curr, wynik;
string s1, s2, s3;
bool carry;

int main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  cin >> s1 >> s2 >> s3;
  n = s1.size();
  for (int i = n-1; i >= 0; i--)
  {
    //cout << wynik << ' ' << curr << ' ' << i << ' ';
    int a = s1[i]-'0';
    int b = s2[i]-'0';
    int c = s3[i]-'0';

    if (a + b == c)
    {
      if (carry) curr = 0;
      wynik += ++curr;
      carry = false;
      continue;
    }
    if (a + b == c + 10)
    {
      if (carry) curr = 0;
      carry = true;
      continue;
    }
    if (carry)
    {
      if (a + b + 1 == c)
      {
        wynik += ++curr;
        carry = false;
        continue;
      }
      if (a + b + 1 == c + 10)
      {
        continue;
      }
    }
    curr = 0;
    carry = false;
  }
  cout << wynik;

  return 0;
}