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#include <bits/stdc++.h>

using namespace std;

#define int long long

int32_t main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int n;
    string a;
    string b;
    string fn;
    cin>>a>>b>>fn;
    n= a.size();
    int res = 0;

    int c_0 = 0;
    int c_1 = 0;

    for(int i = n-1;i>=0;i--){
        int cur = (a[i]-48)+(b[i]-48);
        int c = 0;
        if(cur>=10){
            cur-=10;
            c=1;
        }

        if(c==1){
            if(cur == (fn[i]-48)){
                c_1 = c_0;
                c_1++;
                c_0 = 0;
            }else if(cur + 1 == (fn[i]-48)){
                c_0 = 0;
            }else{
                c_0 = 0;
                c_1 = 0;
            } 

        }else{
            if(cur == (fn[i]-48)){
                c_0++;
                res+=(c_0);
                c_1=0;
            }else{
                cur+=1;
                if(cur>=10){
                    cur-=10;
                    c=1;
                }
                if(c==1){

                    if(cur == (fn[i]-48)){
                        c_0 = 0;
                    }else{
                        c_0 = 0;
                        c_1 = 0;
                    } 

                }else{
                    if(cur == (fn[i]-48)){
                        res+=c_1;
                        c_0 = c_1;
                        c_1=0;
                    }else{
                        c_0 = 0;
                        c_1 = 0;
                    }
                }

            }
            
            
        }
        
        
    
    }

    cout<<res<<endl;

    return 0;
}