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

#define rep(i,n) for(long long i = 0; i < (long long)(n); i++)
#define repi(i,a,b) for(long long i = (long long)(a); i < (long long)(b); i++)
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
#define mt make_tuple
#define mp make_pair
template<class T1, class T2> bool chmin(T1 &a, T2 b) { return b < a && (a = b, true); }
template<class T1, class T2> bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

using ll = long long; using ld = long double; using vll = vector<ll>; using vvll = vector<vll>; using vld = vector<ld>; 
using vi = vector<int>; using vvi = vector<vi>;
vll conv(vi& v) { vll r(v.size()); rep(i, v.size()) r[i] = v[i]; return r; }
using P = pair<ll, ll>;

template <typename T, typename U> ostream &operator<<(ostream &o, const pair<T, U> &v) {  o << "(" << v.first << ", " << v.second << ")"; return o; }
template<size_t...> struct seq{}; template<size_t N, size_t... Is> struct gen_seq : gen_seq<N-1, N-1, Is...>{}; template<size_t... Is> struct gen_seq<0, Is...> : seq<Is...>{};
template<class Ch, class Tr, class Tuple, size_t... Is>
void print_tuple(basic_ostream<Ch,Tr>& os, Tuple const& t, seq<Is...>){ using s = int[]; (void)s{0, (void(os << (Is == 0? "" : ", ") << get<Is>(t)), 0)...}; }
template<class Ch, class Tr, class... Args> 
auto operator<<(basic_ostream<Ch, Tr>& os, tuple<Args...> const& t) -> basic_ostream<Ch, Tr>& { os << "("; print_tuple(os, t, gen_seq<sizeof...(Args)>()); return os << ")"; }
ostream &operator<<(ostream &o, const vvll &v) { rep(i, v.size()) { rep(j, v[i].size()) o << v[i][j] << " "; cout << endl; } return o; }
template <typename T> ostream &operator<<(ostream &o, const vector<T> &v) { o << '['; rep(i, v.size()) o << v[i] << (i != v.size()-1 ? ", " : ""); o << "]";  return o; }
template <typename T>  ostream &operator<<(ostream &o, const set<T> &m) { o << '['; for (auto it = m.begin(); it != m.end(); it++) o << *it << (next(it) != m.end() ? ", " : ""); o << "]";  return o; }
template <typename T, typename U>  ostream &operator<<(ostream &o, const map<T, U> &m) { o << '['; for (auto it = m.begin(); it != m.end(); it++) o << *it << (next(it) != m.end() ? ", " : ""); o << "]";  return o; }
template <typename T, typename U>  ostream &operator<<(ostream &o, const unordered_map<T, U> &m) { o << '['; for (auto it = m.begin(); it != m.end(); it++) o << *it; o << "]";  return o; }
void printbits(ll mask, ll n) { rep(i, n) { cout << !!(mask & (1ll << i)); } cout << endl; }
#define ldout fixed << setprecision(40) 

static const double EPS = 1e-14;
static const long long INF = 1e18;
static const long long mo = 1e9+7;

int main(void) {
    cin.tie(0); ios::sync_with_stdio(false);
    ll n; 
    while (cin >> n && n) {
        string d(n, ' ');
        vector<char> x(n); rep(i, n) cin >> x[i];
        vector<char> y(n); rep(i, n) cin >> y[i];
        rep(i, n) {
            d[i] = (x[i] - y[i] < 0 ? x[i] - y[i] + 10 : x[i] - y[i]) + '0';
        }
//        cout << d << endl;

        static queue<pair<string, ll>> q;
        static set<string> s;
        queue<pair<string, ll>>().swap(q);
        s.clear();

        q.push(mp(d, 0));
        int queue_max = 0;
        while (!q.empty()) {
            queue_max = max(queue_max, (int)q.size());
            auto tmp = q.front().fi; auto d = q.front().se; q.pop();
//            cout << d << " " << tmp << endl;

            if (tmp == string(n, '0')) {
                cout << d << endl;
//                cout << queue_max << "#MAX SIZE" << endl;
                goto next;
            }

            ll i = 0;
            while (tmp[i] == '0') i++;
            ll number = tmp[i] - '0';
            repi(j, i, n) {
                tmp[j] = '0' + ((tmp[j] - '0' - number) + 10) % 10;
                /*
                cout << j << " " << i << " " << number << endl;
                cout << tmp << endl;
                */
                if (!s.count(tmp)) {
                    q.push(mp(tmp, d+1));
                    s.insert(tmp);
                }
            }
        }
        next:;
    }
    return 0;
}

Measured memory_bytes: 4268