#include <bits/stdc++.h>

using namespace std;

bool OkBits(int index, char c, bool isodd = 0){
    if((c == '0' || c == '3' || c == 'C' || c == 'F') || (isodd && (c == 'D' || c == 'E') || (isodd && index > 0 && (c == '1' || c == '2' ))))
            return 1;
    return 0;
}

int main()
{
    int x, n;
    string t;
    cin >> x >> n >> t;
    bool ans = true;

    for (int i = 0, pos = 0; i < n; i += 2, pos++) {
        if (i == n - 1) {
            ans &= (OkBits(i, t[pos]) | OkBits(i, t[pos], 1));
            break;
        }
        if (!OkBits(i, t[pos])){
            ans = 0;
            break;
        }
    }

    if (ans)
        cout << "Nuslan is leaving us";
    else
        cout << "Nuslan stays";
    return 0;
}