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


int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	string a, b, c;
	cin>>a>>b>>c;
	LL res = 0;
	
	vector<char> v(a.size());
	
	reverse(a.begin(), a.end());
	reverse(b.begin(), b.end());
	reverse(c.begin(), c.end());
	
	char prev = 'x';
	
	for(unsigned i=0; i<a.size(); i++){
		if(a[i]-'0' + b[i] - '0' == c[i] - '0'){
			v[i] = 'a';
		}else if(a[i]-'0' + b[i] - '0' == c[i] - '0' + 10){
			v[i] = 'b';
		}else if(a[i]-'0' + b[i] - '0' + 1 == c[i] - '0'){
			if(prev == 'x' || prev == 'a' || prev == 'c'){
				v[i] = 'x';
			}else{
				v[i] = 'c';
			}
		}else if(a[i]-'0' + b[i] - '0' + 1 == c[i] - '0' + 10){
			if(prev == 'x' || prev == 'a' || prev == 'c'){
				v[i] = 'x';
			}else{
				v[i] = 'd';
			}
		}else{
			v[i] = 'x';
		}
		prev = v[i];
	}
	v.push_back('x');
	vector<int> s(a.size()+1);
	
	for(unsigned i=0; i<v.size(); i++){
		int x = 0;
		if(v[i]=='a' || v[i] == 'c')x=1;
		s[i+1] = s[i] + x;
	}
	
	
	prev='x';
	for(unsigned i=0, j=0; i<a.size(); i++){
		if(j<=i){
			j=i;
			prev='x';
		}
		while(v[j] != 'x'){
			if((prev == 'b' || prev == 'd') && (v[j] == 'a' || v[j]=='b' )){
				//prev = v[j];
				//j++;
				break;
			}
			prev = v[j];
			j++;
		}
		if(v[i] == 'a' || v[i] == 'b'){
			res += s[j] - s[i];
		}
	}
	
	cout<<res<<"\n";
	return 0;
}