#include <iostream>
#include <sstream>
using namespace std;
const int N = 1E6 + 10;
int a[N], flag[N];
int main(){
    int n;  cin >> n;
    string s;
    int k = 0;
    getchar();
    while(n -- ){
        getline(cin, s);

        stringstream scin(s);
        while(scin >> a[k]) k ++ ;
    }
    int recome, lack;
    int minv, maxv;
    minv = 0x3f3f3f, maxv = -1;
    for(int i = 0; i < k; i ++ ){
        flag[a[i]] ++ ;
        if(flag[a[i]] == 2) recome = a[i];
        minv = min(minv, a[i]);
        maxv = max(maxv, a[i]);
    }
    for(int i = minv; i < maxv; i ++ ){
        if(!flag[i])    lack = i;
    }
    cout << lack << " " << recome << endl;
    return 0;
}