#include <stdio.h>
#include <string.h>

using namespace std;

int main() {
    char sir[100];
    scanf ("%s", sir);
    int len = strlen(sir);
    for (int i = 4; i < len; ++i) {
        if (sir[i] != 'i') continue;
        if (sir[i-1] != 'd') continue;
        if (sir[i-2] != 'r') continue;
        if (sir[i-3] != 'a') continue;
        if (sir[i-4] != 'Y') continue;
        printf ("DA\n");
        return 0;
    }
    printf ("NU\n");
    return 0;
}