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#include <iostream>

using namespace std;

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

  string a,b,c;
  cin >> a >> b >> c;
  int n = a.size();

  long long intervals = 0;
  long long carry = -1;

  long long result = 0;
  for(int i = n-1; i >= 0; i--) {
    long long diff = (a[i] - '0') + (b[i] - '0') - (c[i] - '0');
    if(diff == 0) {
      if(carry == 1) {
        intervals = 0;
      }
      intervals ++;
      result += intervals;
      carry = 0;

    } else if(diff == 10) {
      if(carry == 1) {
        intervals = 0;
      }
      intervals ++;
      carry = 1;

    } else if (diff == 9) {
      if(carry != 1) {
        intervals = 0;
      }
      carry = 1;
      
    } else if(diff == -1) {
      if(carry != 1) {
        intervals = 0;
      }
      result += intervals;
      carry = 0;


    } else {
      intervals = 0;
      carry=-1;
    }
  }

  cout << result << endl;
}