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#include <iostream>
#include <string>
using namespace std;
const int maxn=1e6+7;
int dp0[maxn];
int dp1[maxn];


int main() 
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    string a,b,c;
    cin>>a>>b>>c;
    int idx=0;
    long long ans=0;
    
    for(int i=a.size()-1;i>=0;i--)
    {
      int sum1=a[i]+b[i]-96;
      int sum2=int(a[i])+int(b[i])+1-96;
      idx++;
      
      if(sum1==c[i]-48)
      {
        dp0[idx]=dp0[idx-1]+1;
        
      }
      if(sum2==c[i]-48)
      {
        
        dp0[idx]=dp1[idx-1];
      }
      sum1-=10;
      sum2-=10;
      if(sum1==c[i]-48)
      {
        
        dp1[idx]=dp0[idx-1]+1;
        
      }
      if(sum2==c[i]-48)
      {
        
        dp1[idx]=dp1[idx-1];
      }
      
      ans+=dp0[idx];
      
    }
    cout<<ans;
    
    return 0;
}