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#include <bits/stdc++.h>
using namespace std;
int main()
{
	string s1,s2,s3;
	cin>>s1;
	cin>>s2;
	cin>>s3;
	int n=s1.length();
	long long int res=0;
	int pot=0;
	int car=0;
	for(int i=n-1; i>=0; i--)
	{
		int a=s1[i]-'0';
		int b=s2[i]-'0';
		int c=s3[i]-'0';
		if(((a+b+car)%10)!=c)
		{
			pot=0;
			car=0;
		}
		if((a+b)%10==c)
		{
			pot++;
		}
		if(a+b+car==c)
		{
			res+=pot;
			//cout<<i<<"\n";
		}
		car=(a+b+car)/10;
	}
	/*for(int i=n-1; i>=0; i--)
	{
		car=0;
		for(int j=i; j>=0; j--)
		{
			int a=s1[j]-'0';
			int b=s2[j]-'0';
			int c=s3[j]-'0';
			if((a+b+car)%10!=c)
				break;
			car=(a+b)/10;
			if(car==0)
				cout<<j<<" "<<i<<"\n";
		}
	}*/
	cout<<res<<"\n";
}