Sam and substtrings

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 #include<bits/stdc++.h>
#define ll          long long
 #define pb          push_back
 #define	endl		'\n'
 #define pii         pair<ll int,ll int>
 #define vi          vector<ll int>
 #define all(a)      (a).begin(),(a).end()
 #define F           first
 #define S           second
 #define sz(x)       (ll int)x.size()
 #define hell        1000000007
 #define rep(i,a,b)	for(ll int i=a;i<b;i++)
 #define lbnd        lower_bound
 #define ubnd        upper_bound
 #define bs          binary_search
 #define mp          make_pair
 using namespace std;

 #define N  100005

 int main()
 {
 	ios_base::sync_with_stdio(false);
 	cin.tie(0);
 	cout.tie(0);
 	int TESTS=1;
 //	cin>>TESTS;
 	while(TESTS--)
 	{
 		string s;
        cin>>s;
        ll n=s.length();
        vi dp(n);
        ll sum=0;
        dp[0]=s[0]-'0';
        sum+=dp[0];
        rep(i,1,n)
        {
            dp[i]=(10*dp[i-1]+(i+1)*(s[i]-'0'))%hell;
            sum=(sum+dp[i])%hell;
        }
        cout<<sum%hell;
 	}
 	return 0;
 }