#include <iostream>
#include <cstring>
using namespace std;
const int maxn = 105;
string s[maxn];
int n;

int to_int(string & S) {
    int res = 0;
    for(int i = 0; i < (int) S.size(); i++) {
        res = (res * 10) + (S[i] - '0');
    }

    return res;
}

int dp[maxn];
int rec(int at) {
    if(at >= n) {
        return 1;
    }
    if(at == n - 1 and s[at] == "N") {
        return 1;
    }
    if(dp[at] != -1) {
        return dp[at];
    }

    int res = 0;

    if(s[at] == "N") {
        int num = -1;
        int cnt = 0;
        for(int i = at; i < n; i++) {
            if(s[i] != "N") {
                if(num == -1) {
                    num = to_int(s[i]);
                }
            }

            if(s[i] == "N" and num == -1) {
                res += rec(i + 1);
            }

            if(s[i] != "N" and num != to_int(s[i])) {
                break;
            }
            cnt++;

            if(cnt == num) {
                res += rec(i + 1);
            }
        }
    }
    else {
        int cnt = 0;
        int num = -1;
        for(int i = at; i < n; i++) {
            if(s[i] != "N" and num == -1) {
                num = to_int(s[i]);
            }

            if(s[i] != "N" and num != to_int(s[i])) {
                break;
            }

            cnt++;
            if(cnt == num) {
                res += rec(i + 1);
            }
        }
    }

    dp[at] = res;
    return dp[at];
}
int main() {
    memset(dp, -1, sizeof dp);
    cin >> n;

    int cnt = 0;
    for(int i = 0; i < n; i++) {
        cin >> s[i];
        if(s[i] == "N") {
            cnt++;
        }
    }

    if(cnt == n) {
        cout << "NE" << endl;
    }
    else if(rec(0) <= 1) {
        cout << "DA" << endl;
    }
    else {
        cout << "NE" << endl;
    }
    return 0;
}