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//Solution by Mikołaj Kołek

#include "bits/stdc++.h"
#define intin *istream_iterator<int>(cin)

using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	string a, b, c;
	cin >> a >> b >> c;
	int n = a.length();
	
	long long matching = 0, withCarry = 0, res = 0;
	for(int i = n - 1; i >= 0; i--) {
		int sum = (a[i] - '0') + (b[i] - '0'), target = c[i] - '0';
		
		if(sum == target) {
			matching++;
			withCarry = 0;
			res += matching;
		}
		else if(sum == (target - 1)) {
			matching = withCarry;
			withCarry = 0;
			res += matching;
		}
		else if(sum == (target + 10)) {
			withCarry = matching + 1;
			matching = 0;
		}
		else if(sum == (target + 9))
			matching = 0;
		else
			matching = withCarry = 0;
	}
	
	cout << res << "\n";
	
	return 0;
}