#include <iostream>
#include <vector>

using namespace std;

#define REP(i,n) for(int i = 0; i < (int)(n); i++)
#define FOR(i,c) for(__typeof((c).begin()) i = (c).begin(); i != (c).end(); ++i)
#define ALLOF(c) (c).begin(), (c).end()

int main() {

    string s;
    while(cin >> s && s != "0") {
        int n = s.size();
        vector<int> v(n), u(n+1, 0);
        for(int i = n-1; i >= 0; i--) {
            v[i] = (int)(s[i] - '0');
            if (i % 2 == 1)
                v[i] = (11 - v[i]) % 11;
            u[i] = (v[i] + u[i+1]) % 11;
        }
        long long res = 0;
        int eleven[11] = {1};
        for(int i = n-1; i >= 0; i--) {
            if (v[i] != 0)
                res += eleven[u[i]];
            eleven[u[i]]++;
        }
        cout << res << endl;
    }

    return 0;
}