#include <bits/stdc++.h>
#define pp push_back
#define ll long long
#define endl '\n'
#define pb push_back
#define f first
#define s second
#define vl vector<ll>
#define all(v) (v).begin(),v.end()
#define go(i,a,b)  for (int i = a; i<b ;i++)
#define gorev(i,a,b) for(int i =a ; i>b ;i--)
#define faster ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)


using namespace std;
int findFirstMissing(vector<int> arr , int start ,
                        int  end,int first)
{

  if (start < end)
  {
    int mid = (start + end) / 2;

    /** Index matches with value
      at that index, means missing
      element cannot be upto that po*/
    if (arr[mid] != mid+first)
      return findFirstMissing(arr, start,
                                 mid , first);
    else
      return findFirstMissing(arr, mid + 1,
                                 end , first);
  }
  return start + first;

}
int findFM(vector<int> arr)
{
sort(all(arr)) ;
  // Check if 0 is missing
  // in the array
  if(arr[0] != 0)
    return 0;

  // Check is all numbers 0 to n - 1
  // are present in array
  if(arr[arr.size() - 1] == arr.size() - 1)
    return arr.size();

  int first = arr[0];

  return findFirstMissing(arr, 0, arr.size() - 1, first);
}


void dosth() {

int n ;
cin >> n ;

map <string , vector<int>  > mp ;


for (int i =0 ;i< n;i++) {

    string s ; cin >>s ;

    if(!mp[s].size()) {
        cout << "ok\n";mp[s].pb(0) ;
        string tt ="" ; int acc =0 ;

        for (int j =0 ;j<s.length() ;j++){
            if(isdigit(s[j])){

                int d = s[j]-'0' ;
                acc*=10 ;
                acc+=d ;
            }
            else {
                tt+=s[j] ;
            }

        }
        if(acc!=0)
        mp[tt].pb(acc) ;
        //cout << tt <<acc << " " <<endl; ;
    }
    else {

    int t = findFM(mp[s]) ;
if(t==0) {
    cout <<"ok" <<endl ;
    mp[s].pb(0) ;
}
else{
    string temp = s + (char)(48+t) ;
    mp[temp].pb(0) ;
    mp[s].pb(t) ;
    cout << temp <<endl ;

}
    }

}
}




int main () {
faster ;

int t =1;
//cin >>t ;
while(t--){

    dosth() ;

}


return 0 ;
}