#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main() {
	int i, j, k;   
	int h, n;
	vector<int>num;

	cin >> h >> n;

	//n--;

	//num.push_back(-1);

	for (i = 0; i < n-1; i++) {
		int nn;
		cin >> nn;
		num.push_back(nn);
	}

	sort(num.begin(), num.end(), greater<int>());

	num.insert(num.begin() + 0, -1);

	bool flag = false;

	for (i = 1; i < n; i++) {
		if (num[i] < h) {
			string st;

			int ii = i % 10;

			if (ii == 1) st = "st";
			if (ii == 2) st = "nd";
			if (ii == 3) st = "rd";
			if (ii >= 4 || ii== 0) st = "th";

			cout << i << st << endl;
			flag = true;
			break;
		}
	}

	//n++;

	if (flag == false) {
		string st;

		int nnn = n % 10;

		if (nnn == 1) st = "st";
		if (nnn == 2) st = "nd";
		if (nnn == 3) st = "rd";
		if (nnn >= 4 || n == 0 ) st = "th";

		cout << n + 1 << st << endl;
	}





	getchar();
	getchar();
	return 0;
}