#include <bits/stdc++.h>
using namespace std;
#define cin_2d(vec, n, m) for(int i = 0; i < n; i++) for(int j = 0; j < m && cin >> vec[i][j]; j++);
#define cout_2d(vec, n, m) for(int i = 0; i < n; i++, cout << "\n") for(int j = 0; j < m && cout << vec[i][j] << " "; j++);
#define cout_map(mp) for(auto& [f, s] : mp) cout << f << " " << s << "\n";
#define Time cerr << "Time Taken: " << (float)clock() / CLOCKS_PER_SEC << " Secs" << "\n";
#define fixed(n) fixed << setprecision(n)
#define ceil(n, m) (((n) / (m)) + ((n) % (m) ? 1 : 0))
#define fill(vec, value) memset(vec, value, sizeof(vec));
#define Num_of_Digits(n) ((int)log10(n) + 1)
#define mod_combine(a, b, m) (((a % m) * (b % m)) % m)
#define all(vec) vec.begin(), vec.end()
#define rall(vec) vec.rbegin(), vec.rend()
#define sz(x) int(x.size())
#define debug(x) cout << #x << ": " << (x) << "\n";
#define fi first
#define se second
#define Pair pair < int, int >
#define ll long long
#define ull unsigned long long
#define Mod 1'000'000'007
#define OO 2'000'000'000
#define EPS 1e-9
#define PI acos(-1)
template < typename T = int > istream& operator >> (istream &in, vector < T > &v) {
for (auto &x: v) in >> x;
return in;
}
template < typename T = int > ostream& operator << (ostream &out, const vector < T > &v) {
for (const T &x: v) out << x << ' ';
return out;
}
void AhMeD_HoSSaM(){
ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
#endif
}
void Solve(){
int n;
map < string, int > mp;
cin >> n;
for (int i = 0; i < n; i++){
string x;
cin >> x;
mp[x]++;
if (mp[x] == 1) cout << "ok" << "\n";
else {
int idx = 0;
while(mp[x + to_string(mp[x] - 1 + idx)] != 0) idx++;
cout << x << mp[x] - 1 + idx << "\n", mp[x + to_string(mp[x] - 1 + idx)]++;
}
}
}
int main(){
AhMeD_HoSSaM();
int t = 1;
//cin >> t;
while(t--)
Solve();
return 0;
}
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