map.cpp

int main()
{
    int n;
    scanf("%d", &n);
    map<string, int>mp;
    for(int i=0; i<n; i++){
            string s;
            cin>>s;
        if(mp[s] == 0) {mp[s]++; printf("OK\n");}
        else {
            cout<<s<<mp[s]<<endl;
            mp[s]++;
        }
    }
    return 0;
}