#include <iostream>
#include <cstring>
#include <iomanip>
 
using namespace std;
 
char s1[101], s2[101];
 
int main()
{
    cin.getline(s1, 101);
    cin.getline(s2, 101);
    int lungime1 = strlen(s1);
    int lungime2 = strlen(s2);
    for (int i = 0; i < lungime1; ++i) {
        if (s1[i] == s2[0]) {
            int j = 1;
            ++i;
            while (s1[i] == s2[j] && j < lungime2) {
                ++j;
                ++i;
            }
            if (j == lungime2) {
                cout << "DA";
                return 0;
            }
        }
    }
    cout << "NU";
}

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YXppCmF6aQ==

azi
azi