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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define st first
#define nd second
#define pii pair<ll,ll>
#define pb push_back
#define pf push_front
#define lll __int128
#define si size()
#define int ll
const int A=1e6+3;
int dp[A][2];
signed main(){
    ios_base::sync_with_stdio(0);
   cin.tie(0);
    int sum=0,n,k;
    string a,b,c;
    cin>>a>>b>>c;
    n=a.si;

    for(int i=n-1;i>=0;i--){
        int su=a[i]+b[i]-'0'-'0',wy=c[i]-'0';

        if(su==wy) dp[i][0]=dp[i+1][0]+1;
        if(su+1==wy) dp[i][0]=dp[i+1][1];
        if(su-10==wy) dp[i][1]=dp[i+1][0]+1;
        if(su-9==wy) dp[i][1]=dp[i+1][1];
    }
    // for(int i=0;i<n;i++)
    //     cout<<i<<' '<<dp[i][0]<<' '<<dp[i][1]<<'\n';
    for(int i=0;i<n;i++) sum+=dp[i][0];
    cout<<sum<<'\n';
    return 0; 
}