#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef string str;

#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define len(x) ((int)(x).size())

#define forn(i, n) for (int i = 0; i < (int)(n); ++i)
#define forr(i, l, r) for (int i = (int)(l); i <= (int)(r); ++i)
#define ford(i, r, l) for (int i = (int)(r); i >= (int)(l); --i)

#define cmin(a, b) a = min(a, b)
#define cmax(a, b) a = max(a, b)

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

	int so;
	int n;
	cin >> so;
	cout << "Nhap so: " << so << endl;
	cin >> n;
	cout << "Nhap n: " << n << endl;
	if(to_string(n).length() != so){
		cout << "ko đủ số" << endl;
		return 0;
	}else{
		if(n == 0){
			cout << 5;
			return 0;
		}
		int ans = 0;
		int p = 1;
		
		while(n > 0){
			int c = n % 10;
			if(c == 0){
				c = 5;
			}
			ans += c * p;
			p *= 10;
			n = n / 10;
		}
		cout << ans << endl;
	}
	
    return 0;
}