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#include <bits/stdc++.h>
#pragma GCC target ("avx2,fma")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")

#define ll long long
#define ld long double
#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define FOR(i,l,r) for(int i=(l);i<=(r);i++)
#define ROF(i,r,l) for(int i=(r);i>=(l);i--)
using namespace std;
int inf=1000000007;
ll infl=1000000000000000007;
const ll mod=1000000007;

#ifdef LOCAL
auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";}
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X)
#else
#define debug(...){}
#endif

const int N=1000007;

int DP[N][2];

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    string A,B,C;
    cin>>A>>B>>C;
    int n=sz(A);
    ll ans=0;
    ROF(i,n-1,0)
    {
		int s=A[i]-'0'+B[i]-'0',t=C[i]-'0';
		if(s==t)
		{
			int X=1+DP[i+1][0];
			ans+=X;
			DP[i][0]=X;
		}
		else if(s+1==t)
		{
			int X=DP[i+1][1];
			ans+=X;
			DP[i][0]=X;
		}
		else if(s==t+10)
		{
			int X=1+DP[i+1][0];
			DP[i][1]=X;
		}
		else if(s+1==t+10)
		{
			int X=DP[i+1][1];
			DP[i][1]=X;
		}
		debug(i,ans);
	}
	cout<<ans<<endl;
	
    return 0;
}