#include <bits/stdc++.h>
using namespace std;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define vv(type, c, m, n, i) vector<vector<type>> c(m, vector<type>(n, i))
#define rep(i,a,n) for(int i=(a), i##_len=(n); i<i##_len; ++i)
#define rrep(i,a,n) for(int i=(a), i##_len=(n); i>i##_len; --i)
#define len(x) ((int)(x).size())
#define mp make_pair
#define eb emplace_back
#define em emplace
#define fi first
#define se second
#define get(a, i) get<i>(a)
#define mt make_tuple
#define mine min_element
#define maxe max_element
#define sum(a, b) accumulate(a, b)
#define chmax(a,b) if(a<b)a=b
#define chmin(a,b) if(a>b)a=b
#define print(t) cout << (t) << "\n";
#define printk(v) rep(i, 0, len(v) - 1) { cout << v[i] << " "; } cout << v.back() << endl;
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<long long> vll;
typedef vector<string> vs;
typedef vector<bool> vb;
typedef pair<int, int> pii;
const constexpr ll mod = 1000000007;
int main() {
	string s = string("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
	map<char, int> mci;
	map<int, char> mic;
	int k = 0;
	for (char c: s) {
		mci[c] = k;
		mic[k++] = c;
	}
	int n, m; cin >> n >> m;
	string card = s.substr(1, n);
	int a;
	rep(i, 0, m) {
		cin >> a;
		--a;
		card = card[a] + card.substr(0, a) + card.substr(a + 1, n);
	}
	print(mci[card[0]]);
	return 0;
}