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#include <bits/stdc++.h>
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 answer = 0;
	pair<long long, long long> dp = {0, 0};
	for (int i = 0; i < n; i++) {
		int x = a[i] - '0';
		int y = b[i] - '0';
		int z = c[i] - '0';
		dp.first++; // zero
		
		if (x + y == z) {
			dp = {dp.first, 0};
		}
		else if (x + y == z + 10) {
			dp = {dp.second, 0};
		}
		else if (x + y + 1 == z) {
			dp = {0, dp.first};
		}
		else if (x + y + 1 == z + 10) {
			dp = {0, dp.second};
		}
		else {
			dp = {0, 0};
		}
		answer += dp.first;
	}
	
	cout << answer << endl;
}