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#include <bits/stdc++.h>
    using namespace std;
    #define ll long long
    #define st first
    #define nd second
    #define pii pair<int,int>
    #define pb push_back
    #define pp pop_back
    #define si size
    #define int ll
    #define V vector
;
#define cerr if(0) cerr

int dp[2];
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    string a,b,c;
    cin>>a>>b>>c;
    int sum=0;
    for(int i=0;i<(int)a.si();i++){
        int x=a[i]-'0',y=b[i]-'0',z=c[i]-'0';
        if(x+y==z)dp[0]++,dp[1]=0;
        else if(x+y==z+10)dp[0]=dp[1],dp[1]=0;
        else if((x+y+1)%10==z&&x+y+1>9)dp[0]=0;
        else if((x+y+1)%10==z&&x+y+1<10)dp[1]=dp[0]+1,dp[0]=0;
        else dp[0]=dp[1]=0;
        sum+=dp[0];
        // cout<<i<<' '<<dp[0]<<' '<<dp[1]<<'\n';
    }
    cout<<sum<<'\n';
}