using namespace std;
string A[1010];
bool check(int x){
    if(x % 7 == 0){
        return 1;
    }
    while(x){
        if(x%10==7){
            return 1;
        }
        x /= 10;
    }
    return 0;
}
int main(){
    int n,m,e;
    cin >> n >> m >> e;
    queue<string> q;
    for (int i = 1; i <= n; i ++){
        string s;
        cin >> s;
        A[i] = s;
    }
    for (int i = 1; i <= n; i++){
        q.push(A[m]);
        m ++;
        if(m > n){
            m = 1;
        }
    }
    string x;
    while (q.size() > 1){
        x = q.front();
        q.pop();
        if (!check(e)){
            q.push(x);
        }
        e++;
    }
    cout << q.front();
    return 0;
}