#include<iostream>

using namespace std;

typedef long long LL;
const int N =1000010;
int line;
LL cnt[N];
int n, m;



int main(){
    cin>>line;
    int Min=100001, Max=0, a;
    for(int i=0;i<line;i++){
        while(cin>>a){
            cnt[a]++;
            Min = min(Min, a);
            Max = max(Max, a);
        }
    }

    for(int i=Min;i<Max;i++){
        if(cnt[i] == 0) m = i;
        else if(cnt[i] == 2) n = i;
    }


    cout<<m<<" "<<n<<endl;


    return 0;

}