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/*
alias cpl="g++ -std=c++20 -Wall -Wextra -Wshadow -Wconversion -fmax-errors=3 -O0 -ggdb3 -fsanitize=address,undefined -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC -DUNCLE"
alias gdb="ASAN_OPTIONS=detect_leaks=0 gdb -q"
alias gdbb="gdb ./a.out -ex 'start <tes.in'"
alias rnu="./a.out <tes.in >tes.out && cat ./tes.out"
alias q="clear"
*/

#ifndef UNCLE
 #pragma GCC optimize("O3,unroll-loops")
#endif

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

#define FOR(i,p,q) for(int i=(p); i<=(q); ++i)
#define ROF(i,p,q) for(int i=(p); i>=(q); --i)
#define REP(i,q) for(int i=0; i<(q); ++i)
#define pb push_back
#define as assign
#define rz resize
#define Co const
#define al(X) X.begin(), X.end()
#define ral(X) X.rbegin(), X.rend()
#define sz(X) (int)(X.size())
#define ckmx(a,b) a=max(a,b)
#define ckmn(a,b) a=min(a,b)
#define V vector
typedef long long ll;
typedef long double ld;
typedef mt19937_64 mt;
#ifndef UNCLE
 typedef basic_string<bool> vb;
 typedef basic_string<int> vi;
 typedef basic_string<ll> vl;
#else
 typedef V<bool> vb;
 typedef V<int> vi;
 typedef V<ll> vl;
#endif

constexpr ll INFl=(ll)1e18+14;
constexpr int INFi=1e9+14, MX_N=5e5+14;

int N,M,Q;

void Input(){
	string aa,bb,cc;
	cin>>aa>>bb>>cc;
	N=sz(aa);
	vi a(N,-1),b(N,-1),c(N,-1);
	REP(i,N) a[i]=aa[i]-'0',b[i]=bb[i]-'0',c[i]=cc[i]-'0';
	vi cl(N,0),ad(N+1,0);
	int qt=0;
	ll rs=0;
	REP(i,N){
		int g=a[i]+b[i];
		if(g>=10) g-=10,ad[i]=1;
		if(g==c[i]) cl[i]=1;
		else if(g+1==c[i]) cl[i]=2;
		else if(g==9&&c[i]==0) cl[i]=2,ad[i]=1;
		else cl[i]=3;
	}
	REP(i,N){
		if((i&&cl[i-1]==1&&ad[i]==1)||(i&&cl[i-1]==2&&ad[i]==0)) qt=0;
		if(ad[i]==0) ++qt;
		if(cl[i]==3) qt=0;
		if(cl[i]==1) rs+=qt;
	}
	cout<<rs<<"\n";	
}
void Solv(){
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);

    Input();
    Solv();
}