#include <iostream>
#include <vector>
using namespace std;

// レベル1のゆ～文字列
const string YUUSAAN = "yuusaan";

// レベルNの文字列の長さを計算する関数
unsigned long long length(int level) {
    if (level == 1) {
        return 7;
    }
    return 7 * length(level - 1);
}

// 再帰的にK文字目を求める関数
char getCharAt(int level, unsigned long long K) {
    if (level == 1) {
        return YUUSAAN[K - 1];
    }
    
    unsigned long long prevLength = length(level - 1);

    if (K <= prevLength) {
        return getCharAt(level - 1, K);
    } else if (K <= 2 * prevLength) {
        return getCharAt(level - 1, K - prevLength);
    } else if (K <= 3 * prevLength) {
        return getCharAt(level - 1, K - 2 * prevLength);
    } else if (K <= 4 * prevLength) {
        return getCharAt(level - 1, K - 3 * prevLength);
    } else if (K <= 5 * prevLength) {
        return getCharAt(level - 1, K - 4 * prevLength);
    } else if (K <= 6 * prevLength) {
        return getCharAt(level - 1, K - 5 * prevLength);
    } else {
        return getCharAt(level - 1, K - 6 * prevLength);
    }
}

int main() {
    int N;
    unsigned long long K;
    cin >> N >> K;

    cout << getCharAt(N, K) << endl;

    return 0;
}